What does a strong nuclear force do in an atom? it repels electrons from other electrons. it repels protons from other protons. it attracts protons and neutrons. it attracts protons and electrons.

It attracts protons and neutrons.

Explanation:

Within the atomic nucleus, protons have a positive electrical charge. It is known that electric charges of the same sign repel each other. If only the electromagnetic force existed, the protons would disperse and the nucleus could not exist.

The strong nuclear force is what holds the protons in the nucleus together, despite the electric repulsion force. The nuclear force is a hundred times more intense than the electromagnetic force and thanks to it the nucleons (protons and neutrons) remain united.

it's all four options.

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.