What Is True of California's Electorate-I.e.those Who Vote

What is true of California's electorate-i.e.those who vote?

A) They are an "exclusive, self-selected group" that does not broadly represent all eligible voters.
B) They are a group that broadly represents all Californians during presidential election years, but not during off-year elections.
C) It is a group that broadly represents all Californians in every election.
D) Over time the electorate has been growing steadily, meaning that a greater percentage of people vote in elections today than 10, 20, or 30 years ago.