The best practice for understanding the sales reps process in order to increase Salesforce adoption is to host focus groups, conduct surveys, and shadow the sales reps to observe the tools they use and how they use them.
These methods help to elicit feedback and insights from the sales reps, understand their pain points and needs, identify the gaps and opportunities in their current process, and demonstrate the value and benefits of using Salesforce. The other options are either insufficient or irrelevant. Option B does not capture the sales reps' perspectives or preferences, and may not reflect their actual usage of Salesforce. Option C does not address the sales reps' process or challenges, and may not be applicable or effective for them. References:
https://trailhead.salesforce.com/en/content/learn/modules/business-analysis-discovery/plan-and-facilitate-discove