The correct answer is A. Positron.
A positron is the antiparticle of the electron. It has the same mass as an electron, but a positive electric charge. Positrons are created in nuclear decay and particle accelerators. They can also be produced by high-energy photons interacting
with matter.Protons are positively charged particles that are found in the nucleus of atoms. They have a mass that is about 1836 times the mass of an electron.
Alpha particles are positively charged particles that are made up of two protons and two neutrons. They are produced by the radioactive decay of some elements.
Beta particles are high-energy electrons or positrons that are produced by the radioactive decay of some elements.
In conclusion, the antiparticle of an electron is a positron.