Final answer:
The first USO tour occurred in Europe in 1941, coinciding with early U.S. military involvement in the European theater during World War II.
Step-by-step explanation:
The first USO tour occurred in Europe during 1941. The USO, or United Service Organizations, was established to provide entertainment and support to U.S. troops during World War II. Although the start of USO tours is not directly linked to military strategies, an understanding of early U.S. military actions in Europe provides context. The first U.S. action against Axis forces in the European theater took place in North Africa. This focus on Europe aligns with 'Plan D'—a Europe First strategy, which emphasized defeating Germany and Italy prior to focusing on Japan. Therefore, the correct answer to the student's question is A) Europe, 1941.