Kelley's Work and Both Contributed to the Study of Followers

Kelley's work and both contributed to the study of followers as a focus for leadership researchers and writers. What was the basis of these ideas?

A) The basic premise is that effective and successful leadership
Must be effective despite the attributes of the followers as it does not impact upon the corresponding set associated with the leader.
B) The basic premise is that effective and successful leadership depends as much on attributes of the followers as it does on the corresponding set associated with the leader.
C) The basic premise is that effective and successful leadership depends as much on attributes of the leaders as it does not correspond to the set associated with the follower.
D) The basic premise is that effective and successful leadership depends as much on attributes of the followers but it does not correspond to the set associated with the leader.