Nucleons are regarded as composites sub-particles known as A. Mesons B. Quarks C. Leptons D. Photons

The correct answer is B. Quarks.

Nucleons are made up of three quarks each. Protons are made up of two up quarks and one down quark, while neutrons are made up of one up quark and two down quarks.

Mesons are made up of a quark and an antiquark. Leptons are elementary particles that do not interact with the strong force, and photons are elementary particles that are the quantum of the electromagnetic field.

Here is a brief explanation of each option:

• A. Mesons are made up of a quark and an antiquark.
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  The most common mesons are the pion, which is made up of an up quark and an antidown quark, and the kaon,
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  which is made up of an up quark and an antistrange quark.
• B. Quarks are elementary particles that make up protons, neutrons, and other hadrons. There are six types of quarks, which are named up, down, strange, charm, top, and bottom.
• C. Leptons are elementary particles that do not interact with the strong force. The most common leptons are the electron, muon, and tau, and their corresponding neutrinos.
• D. Photons are elementary particles that are the quantum of the electromagnetic field. Photons have no mass and travel at the speed of light.