Approximately 85 Percent of Registered Voters Turn Out for a Presidential

Approximately 85 percent of registered voters turn out for a presidential election,but this figure represents only about 50 percent of the voting-age population.What does this discrepancy suggest?

A) that voters prefer to look at the voting returns on television later in the evening
B) that the "rational" model does not explain voter turnout
C) that people exercise their right to vote out of a sense of duty
D) that registration is a significant barrier to participation