The most reliable, documented pattern for cross-journey handoff based on engagement is to capture the engagement outcome as a persisted, queryable data point rather than attempting to read it indirectly from system-level journey data views, which do not reliably expose per-contact Engagement Split path results in a directly queryable format. In this pattern, Journey A includes an Engagement Split after the email send, and the branch a contact falls into (engaged vs. not) is written out via an Update Contact Activity into a Boolean field on a dedicated Engagement data extension - creating a durable, explicit record of that contact ' s engagement outcome. A separate Automation Studio process then queries this Engagement data extension directly to build the entry-source population for journey B, giving a clean, reliable, and fully controllable handoff mechanism between the two journeys. Options A, B, and D all attempt to derive the engagement outcome by querying system Journey/Journey Activity data views for Engagement Split results, which is not a standard, reliably queryable data structure for this purpose - Engagement Split path outcomes are not natively exposed as a clean Boolean field in those system data views the way this scenario ' s options imply.
Reference: Journey Builder Engagement Split, Update Contact Activity, Cross-Journey Data Handoff Patterns.