To run efficiently and productively, a fusion reaction must operate at temperatures greater than __ degrees C.

Question

A) 100

B) 2,000

C) 1,000,000

D) 100,000,000

E) 350,000,000

Answer 1

E is the best answer, although the actual answer is closer to 800 million degrees.
http://en.wikipedia.org/wiki/Nuclear_fusion

Answer 2

I disagree with the above statement, the sun uses fusion of p-p chains to release energy.
The actual temperature is closer to 50 million degrees i.e. so answer D

See link