In Recent Years Presidential Nominating Conventions Have Included an Increasingly

In recent years presidential nominating conventions have included an increasingly larger proportion of strongly ideological delegates. One explanation for this trend is that

A) television coverage of conventions has encouraged delegates to extreme behavior to attract attention.
B) there has been a rise in more ideological candidates in both parties, such as Pat Buchanan and Jesse Jackson.
C) interest groups have become active, forcing candidates to respond to their demands.
D) party activists, who vote in primaries, tend to be more ideological than the average voter.
E) state laws have overregulated the selection process.