To show sequencing between all tasks (i.e., predecessor/successor relationships and dependency flow), the PM should provide a project network diagram. A summary Gantt chart is great for high-level timelines and major bars, but it can hide the detailed dependency logic that explains why tasks occur in a particular order and how delays propagate. In the CompTIA Project+ objectives, "Project network diagram" is explicitly listed among the key tracking charts/diagrams used to inform project decisions (alongside Gantt and milestone charts).
The other choices don't match the need. A fishbone (Ishikawa) diagram is a root-cause analysis tool for quality issues, not for schedule dependencies. A burndown chart is used mainly in Agile to show remaining work over time, not task-to-task sequencing. A milestone chart highlights key dates, but it doesn't show the detailed dependency chain between tasks.
So, to satisfy the team's request for full sequencing visibility, the PM should share a project network diagram.

The PM should consult the communication plan because it defines who receives updates, what information they need, when/how often they should receive it, and which channel/form should be used (email, meeting, dashboard, report, chat, etc.). Project+ emphasizes tailoring communications to stakeholder needs and using a planned approach to avoid confusion, missed expectations, or inconsistent messaging-especially around deliverables, acceptance, and progress.
A dashboard is a tool that may be used to publish updates, but it doesn't decide communication rules by itself.
A status report is one possible artifact (often produced on a cadence defined in the communication plan), but it's not the governing document for selecting channels and audiences. Meeting minutes document what happened in a meeting; they're useful for traceability, but they're not the primary guide for how deliverable updates should be distributed going forward.
So, when the question is specifically "how to send updates," the communication plan is the source of truth: it ensures consistent delivery, reduces noise, and aligns with stakeholder preferences and governance requirements.

Explanation
Electronic document and record management systems would be the best software solutions to help an institution manage the internal flow for formally responding in writing to citizens' complaints. Electronic document and record management systems are software systems thathelp organizations create, store, organize, manage, track, and distribute electronic documents and records. Electronic document and record management systems can help to improve efficiency, productivity, collaboration, compliance, and security of document and record management processes and workflows

A RACI matrix clarifies roles and responsibilities for tasks, reducing confusion and disagreements among team members. Missing or incomplete information in the RACI matrix could lead to disputes, as it is a key tool for accountability in project management per CompTIA Project+.

Email is a communication tool that allows the project manager to send information to one or more recipients without requiring immediate feedback or confirmation of receipt. Email can be used to broadcast information that is not urgent or critical, such as status updates, meeting minutes, or general announcements1, p. 75