Which of the following is the MOST likely cause of the problem?

Two team members have been assigned to a specific project task. Neither can agree on how the task should be completed. Which of the following is the MOST likely cause of the problem?

A.
The project manager provided an unrealistic schedule.

B.
The team members have a personality conflict.

C.
The work package was not clearly defined.

D.
The team members have different management styles.