Final answer:
Tiffany exhibits a high need for Power as she frequently takes charge and leads her group towards their objectives, indicative of a person driven by the desire to influence and control others in a leadership role.
Step-by-step explanation:
Tiffany is usually the person who takes charge in group situations and steers people towards the group's objective. This type of behavior is indicative of someone with a high need for Power, as opposed to affiliation, autonomy, or achievement. The need for power is characterized by the desire to have control or influence over others and to lead a group towards its goals. Theories such as McClelland's Theory of Needs support this view by suggesting that people with a high need for power are more likely to take on leadership roles and be assertive in guiding others.
Given the context and the behavior described, it is therefore most accurate to say that Tiffany probably has a high need for Power (Option B).