Which describes nuclear fusion?

A. Starts when a neutron slams into an atom, causing the larger atom to split into two smaller atoms.
B. Starts when two atoms slam together, causing the larger atom to split into two smaller atoms.
C. Starts when a neutron slams into an atom, causing two atoms to form one, heavier one.
D. starts when two atoms slam together to form one, heavier atom.

Please help me!

1 answer

C. Starts when a neutron slams into an atom, causing two atoms to form one, heavier one.