Answer:
(a) Proton, (b) Electron (c) tau neutrino.
Explanation:
Elementary particles are the particles without any sub-structure which means they are not composed of other particles.
The elementary particles are classified into three categories which are discussed below:
(1) Quarks: up, down, top, bottom, strange, and charm.
(2) Leptons: electrons, electron neutrino, muon, muon neutrino, tau, tau neutrino.
(3) Bosons: Guon, photons Z bosons, W bosons, Higgs.
Fermions are particles that follow Fermi-Dirac statistics. Fermions consist of all the quarks and leptons. And fermions can also be categorized in elementary particles such as electrons and protons.
Therefore, the fermions in the given question are proton, electron, and tau neutrino.
