Final answer:
Braden negotiated an exchange for 50 American destroyers, providing the United States with d. base rights and access in British territories as a strategy of indirect support during World War II.
Step-by-step explanation:
In exchange for 50 American destroyers, Braden (representing the United States) gave the United States base rights and access to British naval bases in Newfoundland and the Caribbean. This exchange was agreed upon by President Roosevelt in 1939 as a way to provide help to the British while maintaining American neutrality. The Lend-Lease Act, which was approved in March 1941, gave the U.S. government the flexibility to lend or lease military equipment to countries vital to U.S. defense, thereby further reinforcing the military support without direct combat involvement.
During World War II, President Franklin D. Roosevelt agreed to exchange fifty American destroyers with the United Kingdom in exchange for lease rights at British naval bases in Newfoundland and the Caribbean. So, the correct answer is d. Bases rights and access.