Answer :
Answer D .) to send a two-person spacecraft into orbit for two weeks.
It was a bridge program between Mercury and Apollo.
Gemini in Latin means "twins" or "double", which reflected that the spacecraft would hold two astronauts.
To demonstrate endurance of humans and equipment in spaceflight for extended periods, at least eight days required for a Moon landing, to a maximum of two weeks.
[tex]\textbf{Spymore}[/tex]