What happens when a proton and an antiproton collide?
A) They destroy each other and produce energy in the form of gamma rays.
B) One of the protons is converted to a neutron and they form a nucleus of one proton and one neutron.
C) One of the protons is converted to an electron and they form a hydrogen atom.
D) One proton is converted to a neutron and the other is converted to an electron.
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