Question

nasas first attempt to achieve human space flight was called the
apollo program.
gemini program.
mercury program.
explorer program.

Explanation:

The Mercury program was NASA's first human - spaceflight program. The Apollo program was for moon landings. There is no "Gemini" option here which was a later NASA program for two - man flights. The Explorer program was for unmanned space probes.

Answer:

C. Mercury program