The correct answer is B. Neutrino.
A neutrino is a subatomic particle that has a very small mass and no electric charge. It is a lepton, along with the electron and muon. Neutrinos are produced in nuclear reactions, such as those that power the sun. They are also produced by radioactive decay.
Neutrinos are very difficult to detect because they interact
very weakly with matter. They can pass through the Earth without interacting with anything. This makes them very useful for studying the interior of the Earth and other astronomical objects.Protons are positively charged subatomic particles that are found in the nucleus of atoms. They have a mass that is about 1836 times the mass of an electron. Protons and neutrons are collectively called nucleons.
Mesons are subatomic particles that are made up of a quark and an antiquark. They have a mass that is between the mass of an electron and the mass of a proton. Mesons are unstable and decay into other particles very quickly.
Electrons are negatively charged subatomic particles that are found in the atom. They have a mass that is about 1/1836 the mass of a proton. Electrons orbit the nucleus of the atom and are responsible for the chemical properties of the atom.