although fusion is an energetically favorable reaction for light nuclei, it does not occur under standard conditions on earth because:

fission reactions are always favored over fusion reactions

a large amount of energy must be invested into the reaction before it can occur

atoms on earth are generally too large to participate in fusion reactions

fusion reactions usually do not produce sufficient energy to make them worthwhile

The best and most correct answer among the choices provided by your question is the first choice.

Although fusion is an energetically favorable reaction for light nuclei, it does not occur under standard conditions on Earth because: fission reactions are always favored over fusion reactions.

I hope my answer has come to your help. Thank you for posting your question here in . We hope to answer more of your questions and inquiries soon. Have a nice day ahead!