Explanation
The next step for the business analyst to take before build can begin is to get approval and signoff on the requirements from stakeholders. This will ensure that there is alignment on what needs to be done, how it will be done, why it will be done, who will do it, when it will be done, etc. Getting approval and signoff on requirements is also important for managing scope changes or expectations later in the project lifecycle.
Defining the minimal viable product is a step that is more relevant for agile methodology than waterfall methodology. Scheduling sprint planning meetings is also a step that is more relevant for agile methodology than waterfall methodology. References:
https://trailhead.salesforce.com/content/learn/modules/salesforce-business-analyst-certification-prep/requirement

Explanation
The best way for the BA to present ideas for a future state return handling process to the team in a way that is relatable and invites discussion, feedback, and ideas is to use a story using personas to illustrate potential solutions. A story is a narrative that describes how a user interacts with a system or process to achieve a specific goal. A persona is a fictional representation of a typical user of a system or process, based on real data and research. Using a story with personas helps to:
Relate to the team: This helps to show how the potential solutions address the real needs and pain points of the users, and how they improve their experience and satisfaction.
Invite discussion, feedback, and ideas: This helps to engage the team in an interactive and collaborative way, and encourage them to share their opinions, suggestions, or concerns about the potential solutions.
References:
https://trailhead.salesforce.com/en/content/learn/modules/business-analysis-user-stories/write-user-stories

Explanation
The best practice to establish benchmarks to evaluate existing processes is to show tangible impact from changes to processes. Benchmarks are quantifiable measures that can be used to compare current performance with desired performance or best practices. They can help CK evaluate how effective its sales processes are, identify gaps or opportunities for improvement, and measure the results or benefits of process changes.
Proving processes are out of date and require a new solution is not a best practice, but a potential outcome of benchmarking. Comparing processes against CK's closest competitors is not a best practice, but a possible source of benchmarking data. References:
https://trailhead.salesforce.com/content/learn/modules/salesforce-business-analyst-certification-prep/business-pro