2 1Deuterium + 3 1Tritium = 42He + 10n is a .

A. fission reaction
B. alpha decay
C. fusion reaction
D. beta decay

C.fusion reaction

Explanation:

Fusion reaction is the type of reaction that take place in the sun and stars. Fusion is the combining of two or more small nuclei to form a bigger more stable nucleus. This type of reaction releases a large amount of energy, an example is the reaction between deuterium and tritium to give helium, neutron and large amount of heat. The reaction is given below:

 ⇒  

d.7.5cm is your answer

less than one you can't create energy