America's "shoot on sight" policy referred to which of the following?
A. US ships could shoot down German planes if they flew dangerously close to them
B. US ships transporting goods could shoot u-boats (German submarines) upon seeing them
C. US ships transporting goods could sink German ships in response to violations of the Lend-Lease Act of 1941
D. US ships could shoot German submarines as a result of the Atlantic Charter between America and Britain