According to a study by Thad L. Beyle, a political scientist, governors of the biggest states, such as California, New York, and Texas, are important and powerful in political circles because

A) they have greater influence in national political conventions.
B) they are often elevated to potential presidential candidacy because they are governors of these states.
C) the national press covers them closely.
D) all of the above.
E) their influence is just as great as that of governors who represent small states.

D