Final answer:
The number of electoral votes a state has can change based on a population census taken every 10 years to count its residents, which in turn affects the distribution of the House of Representatives. The correct option is A.
Step-by-step explanation:
The number of electoral votes each state has is subject to change every 4 years when a population census is taken to count the residents. Therefore, the correct answer is A. population census; residents. The number of Electoral College votes for each state is the sum of its U.S. Senators and House Representatives.
Following the U.S. Census, which occurs every ten years, legislative districts may be restructured to reflect the changing population distributions. While the total number of House Representatives has been set at 435 since the Permanent Apportionment Act of 1929, the distribution of these seats among the states can change based on the census results.
This process ensures that every vote has equal weight and that each district in the House of Representatives contains a roughly equal number of citizens.