The correct answer is C. An electron has a negative charge and a proton has a positive charge.
An electron is a subatomic particle with a negative elementary electric charge. Electrons belong to the first generation of the lepton particle family, and are generally thought to be elementary particles because they have no known components or substructure. The electron has a mass that is approximately 1/1836 that of the proton.
A proton is a subatomic particle with a positive elementary electric charge. It belongs to the first generation of the hadron particle family, and is generally thought to be a fundamental particle because it has no known components or substructure. Protons belong to the nuclear particles category and are found in the nucleus of every atom. The proton has a mass that is approximately 1836 times that of the electron.
The difference between the charges of an electron and a proton is the basis of the electric force, which is one of the four fundamental forces of nature. The electric force is responsible for the attraction and repulsion of charged particles.