The use of direct primaries instead of the convention system in selecting presidential candidates result in which of the following? I. A weakening of party control over nominations
II. A reduction in the costs of election campaigns
III. An increase in the number of people involved in the choice of candidates
IV. An increase in voter turnout in midterm elections

(A) I and III only
(B) II and IV only
(C) III and IV only
(D) I, II, and III only
(E) I, II, III, and IV