Final answer:
The Lend-Lease Act allowed the United States to provide aid to the Allied powers during World War II, which is option B. This program signified a major shift from noninterventionist policies and was imperative for supporting the war against Axis powers, enhancing U.S. security indirectly.
Step-by-step explanation:
The Lend-Lease Act was a critical program initiated by the United States during World War II, which allowed the U.S. to support the Allied powers strategically and efficiently. Specifically, the Lend-Lease Act allowed the United States to provide aid to the Allied powers, which is option B. Through this program, implemented in March 1941, the U.S. provided about $50 billion in military aid to nations fighting against the Axis powers, such as Britain, France, China, and the Soviet Union. This aid included weapons and other military equipment, which the recipient nations would use in their struggle against Germany and Japan.
In exchange for the military support, the recipient countries agreed to lease certain portions of their territory to the U.S. military. The U.S. viewed the act as imperative for ensuring that the Allies could continue their war efforts, which, in turn, would also benefit U.S. security by ultimately weakening mutual enemies. Thus, the enactment of the Lend-Lease Act marked a significant shift from previous policies of nonintervention and signaled a more direct approach in aiding Allies during the war.