The fundamental attribution error refers to the tendency of: A. observers to favor external attributions in explaining the behavior of others. B. observers to favor internal attributions in explaining the behavior of others. C. actors to favor external attributions in explaining the behavior of others. D. actors to favor situational attributions in explaining their own behavior.

The fundamental attribution error is a cognitive bias in which people tend to overemphasize internal factors (such as personality traits) while neglecting external factors (such as situational factors) when explaining the behavior of others.

A. Observers to favor external attributions in explaining the behavior of others. This option is the opposite of the fundamental attribution error - it suggests that observers favor situational factors over internal factors. B. Observers to favor internal attributions in explaining the behavior of others. This option correctly describes the fundamental attribution error, as it highlights the emphasis on internal factors (such as personality traits) over external factors (situational factors). C. Actors to favor external attributions in explaining the behavior of others. This option switches the roles, making the actor explain others' behavior instead of observers. The fundamental attribution error is about observers, not actors. D. Actors to favor situational attributions in explaining their own behavior. This option is about actors, not observers. It focuses on the actor explaining their behavior, but the fundamental attribution error is relevant to observers estimating the behavior of others.

Based on the understanding of the fundamental attribution error and analysis of each option, the correct answer is: B. Observers to favor internal attributions in explaining the behavior of others.