You are the Scrum Master of a new, to be developed product.

The correct answer is A, because a good first question for you to suggest the group thinks about when forming into teams is how will we make sure all teams have the right amount of expertise. This question helps the group consider the cross-functionality and self-organization of the Development Teams, which are essential for delivering a potentially releasable Increment every Sprint.

References: [Suggested Reading for Professional Scrum Master™ I]