In the context of the contingency model, which of the following is the most powerful element of situational favorability?
a. task structure
b. position power
c. effort-to-performance expectancy
d. leader–member relation

Option (D)

Explanation:

The contingency model given by the psychologist Fred Fiedler is referred to as the contingency theory that is mainly involved with efficacy  and performance of a leader in a business or an organization.  Under this theory of leadership, it is stated that the organization leader’s efficacy is mostly contingent upon the circumstances i.e. how their leadership approach tends to match to these circumstances.