B. Create a Slack channel to gather and discuss feedback from users.

Explanation:

B: Create a Slack channel to gather and discuss feedback from users. This solution directly engages users by creating a platform for them to voice concerns, challenges, and feedback regarding the new Sales Cloud implementation. Facilitating open communication in a familiar and interactive environment like Slack can foster collaboration, help address user issues more quickly, and create a sense of community and support. This approach can improve user satisfaction and adoption rate as users feel their input is valued and their challenges are being addressed.