What Is One Reason Voter Turnout Appears to Have Dropped

What is one reason voter turnout appears to have dropped since 1960?

A) Although the Twenty-Sixth Amendment increased the voting-age population, it lowered the overall figure because younger people have a lower voter turnout.
B) Federal laws have made it more inconvenient to register, so fewer people are making the effort to participate in elections.
C) Historical events of the latter half of the twentieth century have weakened patriotism, which has in turn lowered interest in government affairs.
D) More people are using absentee ballots that are not counted in the calculations of voter turnout, thereby making it appear that fewer people are participating in elections.
E) People have steadily taken less interest in elections as technology has increased the sense of connection to and involvement in the rest of the world.