The correct answer is B) the West.
The region of the United States that attracted to its defense industries and military bases was the West.
The United States military bases and defense industries in the West region of the country attracted immigrants during World War II because there were offering job opportunities in a time where many hands were needed to fabricate products and help the war effort. The United States needed to supply many products that had to be manufactured first, and immigrants found an opportunity to work in military installations and defense fabrics.