What fission and fusion have most in common is that both of these types of nuclear reactions produce lots of energy from amounts of matter.
a. large
b. small
c. equal
d. nuclear

b.Small

Explanation:

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Fusion : It is a process in which heavy nuclei split into lighter nuclei of mass slightly less than the mass of reactant.Because change in  mass from reactant to product convert into energy released during nuclear reaction.Therefore, mass of products slightly smaller than the mass of reactants.

Fission:It is a process in which lighter nuclei combined together and formed heavy nuclei of mass slightly less than the mass of reactants because small amount of mass converted into energy released during the reaction.Therefore, the mass of combined together lighter nuclei in reactant  is greater than the mass of heavy nuclei in product.

During the process of both  fission and fusion nuclear reactions , a large amount of energy released from small amounts of matter.

b.Small

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