The federal census is used as the basis for redistricting.
Answer: Option A
Step-by-step explanation:
Redistricting is the process of the formation of district electoral constituencies. This process is carried out by the respective state legislatures and refers drawing the boundaries of districts to attain the goal of providing equal representation.
The census and survey data serve as an organized database for the authorities carrying out redistricting. It dispenses information about which area has how much population and allows the authority to decide how should be the boundaries redrawn.