The correct option is: "passage of the Lend-Lease Act"
The Loan and Lease Act formally titled An Act to Promote the Defense of the United States was a program under which the United States began to supply food, oil and military equipment to the United Kingdom, to the exiled government of France Free, to the Republic of China and later to the Soviet Union and other allied nations between 1941 and August 1945. The supplies included warships, warplanes and other weapons. It became law on March 11, 1941 and was repealed in September 1945.