Final answer:
Fiedler proposes that situational favorableness is not a determining factor of whether a task- or relationship-oriented style is more effective.
Step-by-step explanation:
The factors that determine whether a task- or relationship-oriented leadership style is more effective, according to Fiedler, include situational favorableness, leader-member relations, task structure, and position power. However, Fiedler does not propose that all of these factors determine the effectiveness of the leadership style. The correct answer is a) Situational favorableness.