Which of the Following Is an Example of Nuclear Fusion

Multiple Choice

Which of the following is an example of nuclear fusion?

A) Hydrogen-1 and hydrogen-2 combine to form helium-3.
B) Polonium-210 decays into lead-206 and an alpha particle.
C) Carbon-14 breaks down into a beta particle and nitrogen-14.
D) Uranium-235 and a neutron produce barium-141, krypton-92, and three neutrons.