Of the following reactions, which is a fusion reaction? a. uranium-235 absorbing a neutron and splitting into xenon-140, strontium-94, and two neutrons b. hydrochloric acid combining with sodium hydroxide to form a salt and water c. carbon-14 decaying into nitrogen-14 and a beta particle d. curium-246 combining with carbon-12 to form nobelium-254 and four neutrons

The fusion reaction is:
D. Curium-246 combining with carbon-12 to form nobelium-254 and four neutrons.

A fusion reaction is a type of nuclear reaction where two smaller nuclei come together with high energy to form a larger nucleus and possibly create other subatomic particles. Fusion reactions emit tremendous amounts of energy. A classical example of a fusion reaction is the combination of hydrogen to form helium, which occurs in the sun and provides it with its energy.