Question

Nuclear fusion is a process where

Answer 1

Answer: B. low mass nuclei are combined into heavier ones, releasing energy in the process

Explanation:

Nuclear fusion is a process which involves the conversion of two small nuclei to form a heavy nuclei along with release of energy.

For Example: $4_1^1\textrm{H}\rightarrow _2^4\textrm{He}+2_{+1}^0\textrm{e}+\text{energy}$

Nuclear fission is a process which involves the conversion of a heavier nuclei into two or more small and stable nuclei along with the release of energy.

For Example:  $_{92}^{235}\textrm{U}+_0^1\textrm{n}\rightarrow _{56}^{143}Ba+_{36}^{90}Kr+3_0^1\textrm{n}$

Thus if a heavier nuclei is being formed from two smaller nuclei releasing energy this is a nuclear fusion reaction.