Answer:
C state legislature
Step-by-step explanation:
The boundaries of congressional districts are drawn by the state legislatures of each state, although there are some states with independent, non-partisan redistricting commissions, for example: Colorado, Michigan, and Arizona.
A problem arises with this system, and is that the party that controls the state legislature largely controls the redistricting process, leading to one of the most well-known political problems of the U.S.: gerrymandering: the drawing of congressional distrincts that heavily favor one party over the others.