Final answer:
David's behavior of constantly challenging team members' viewpoints best aligns with that of an 'arguer', which can cause frustration within the team.
Step-by-step explanation:
The behavior of David, who enjoys challenging members' viewpoints on every issue, is best described as that of an arguer. This type of team member often engages in debates and enjoys discussing various angles of a topic, sometimes to the point of frustrating others in the group. Such behavior may hinder team cohesion and productivity if not managed properly. It is important for team leaders to address this issue by setting clear communication norms, encouraging constructive discussions, and ensuring that everyone's contributions are valued and respected.