Which of the following is a true statement?
A. The citizens of a state may only register to vote after proving to have submitted their census survey.
B. The census is a flawed tool because census workers do not attempt to count all citizens, just a sample.
C. The main purpose of conducting a census every 10 years is to determine representational apportionment.
D. The majority of apportionment changes are due to state-level data collection and not national census data.