Why do political parties most often try to gerrymander voting districts?

a- to gain a political advantage
b-to ensure an equal chance for all candidates
c-to prove they deserve the voters’ support
d- to keep each voting district the same shape

I believe the correct answer from the choices listed above is option A. Political parties most often try to gerrymander voting districts in order to gain a political advantage. Gerrymandering can be best defined as drawing political boundaries to give your party a numeric advantage over an opposing party. Hope this answers the question.