The correct answer is C.
Gerrymandering is a practice intended to establish a political advantage for a particular party or a particular group by manipulating district boundaries.
This is done mostly in two ways: by cracking ( diluting the voting power of the opposing party's supporters), and packing ( concentrating the opposing party's voting power in one district to reduce their voting power in other districts).
Gerrymandering is used to achieve imbalance in particular demographics, in order to obtain the desired political results.