initiation of nuclear fusion increase in noble gas destabilization increase in thermal energy initiation of photosynthesis reactions
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The compression of matter due to gravitational attraction increased as the protoplanets formed. What was a result of this compression within each protoplanet?
Possibilities:
- initiation of nuclear fusion
- increase in noble gas destabilization
- increase in thermal energy
- initiation of photosynthesis reactions

increase in thermal energy