Explanation
The format of the design challenge statement is how might we + verb + user + need + context, which is a solution-free way of framing a problem or opportunity space. Option B reflects this format by asking how might we save our existing customers time by preemptively serving them the info they need to deflect customer support calls. Option A is an example of a user story, which is a solution-oriented way of expressing a user requirement. Option C is an example of a goal statement, which is a high-level way of expressing a desired outcome.

Explanation
The team should use a prioritization matrix to justify the strategy. A prioritization matrix is a tool that helps evaluate and rank ideas or features based on two criteria, such as impact and effort. It helps determine the most valuable and viable solutions, and communicate the benefits and trade-offs of each option. References:
https://trailhead.salesforce.com/en/content/learn/modules/salesforce-strategy-designer-certification-prep/prioritiz

Explanation
Creating Jobs To Be Done is part of the define phase of the design thinking process. This phase involves synthesizing the insights from the empathize phase and framing the problem statement in a human-centered way. Jobs To Be Done are statements that describe what customers are trying to achieve or accomplish through a product or service. References:
https://trailhead.salesforce.com/en/content/learn/modules/salesforce-strategy-designer-certification-prep/create-jo

Explanation
The strategy designer should share customer needs and tie them to business goals to build a shared understanding and agreement among business leaders to move forward with the new initiative of creating a new line of sustainable footwear. This helps demonstrate the value and relevance of the initiative, and how it aligns with the business vision and objectives.
References:https://trailhead.salesforce.com/en/content/learn/modules/salesforce-strategy-designer-certification-p

The best thing to rely on to get stakeholder buy-in for a redesign of digital commerce experience is research findings and a competitive analysis, as this helps demonstrate the user needs and pain points, and the market opportunities and threats. Wireframes and a total addressable market calculation or inspiring graphics and personas may not be persuasive or comprehensive enough for stakeholder buy-in.