What occurs in both fusion and fission reactions?

(1) Small amounts of energy are converted into

large amounts of matter.

(2) Small amounts of matter are converted into

large amounts of energy.

(3) Heavy nuclei are split into lighter nuclei.

(4) Light nuclei are combined into heavier nuclei

I believe the correct answer from the choices listed above is option 2. Small amounts of matter are converted into

large amounts of energy occurs in both fusion and fission reactions. They are nuclear reactions where a change in the identity or characteristics of an atomic nucleus results when it is bombarded with an energetic particle, as in fission, fusion, or radioactive decay.