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, the Gemini program followed Mercury and focused on longer spaceflights and spacewalks, and the Explorer program was a series of unmanned space missions.

Answer:

C. Mercury program