Answer:
Congressional seats are reapportioned every decade to accommodate changes in state populations after the census is taken. So, the correct answer is:
d. to accommodate changes in state populations after the census is taken
The United States conducts a census every ten years to count the population, and the results of the census are used to determine how many congressional seats each state should have in the U.S. House of Representatives. This process is known as reapportionment. As population shifts occur over time, some states may gain or lose seats in the House of Representatives to ensure that each state's representation is roughly proportional to its population. This helps to maintain the principle of "one person, one vote" and ensure that the House of Representatives accurately reflects the demographic changes in the country.
Step-by-step explanation: