Hydrogen Must Be Raised to a High Temperature Before It

Hydrogen must be raised to a high temperature before it will fuse. This is because

A) high temperatures are needed to overcome the strong nuclear force between hydrogen nuclei.
B) high temperatures are needed to overcome the electric repulsion between hydrogen nuclei.
C) fusion and all other forms of chemical combustion must be initiated by high temperatures.
D) this reaction consumes more thermal energy than it produces.
E) this reaction must consume a large amount of thermal energy in order to produce nuclear energy.