Which of the Following Statements About Gerrymandering Today Is Accurate

Which of the following statements about gerrymandering today is accurate?

A) Democrats have a significant advantage because their irregular voters can easily be mobilized so that makes Republican House members more vulnerable.
B) The adoption of nonpartisan commissions has wiped out any partisan advantage so every congressional district is competitive.
C) Even with gerrymandering, House election results generally do not follow partisan leanings of the district because of ticket splitting.
D) Republicans have an advantage because their regular voters are distributed more efficiently across House districts so fewer votes are wasted in highly skewed districts.