Answer:
(d) Guon
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.
Therefore, Guon is the only boson in the given question.
