Which of the following is a type of antimatter created in some nuclear fusion reactions within stars?

A. photon

B. positron

C. neutrino

D. helium-4

A type of antimatter created in some nuclear fusion reactions within stars is B. Positron. Antimatter is composed of antiparticles, and is considered to be the opposite of matter. Its antiparticles have the same mass as ordinary particles, but they have the opposite charge. When matter and antimatter come into contact, annihilation or destruction occurs.