What Does the Protection Against "Double Jeopardy" Mean

What does the protection against "double jeopardy" mean?

A) That the government cannot try a person more than once for the same crime.
B) That the government cannot try a person more than twice for the same crime.
C) That the government must have double proof to prosecute a person twice for the same crime.
D) That the government must show that at least two people were injured by the defendant in order to justify trying the defendant twice for the same crime.
E) That the government may impose a double sentence on a repeat offender in order to protect the public.