Which argument best explains the charge of an atomic nucleus?

Question

An atomic nucleus is positively charged because it is composed of neutrons.
An atomic nucleus is positively charged because it is composed of protons.
An atomic nucleus is negatively charged because it is composed of electrons.
An atomic nucleus is negatively charged because it is composed of neutrons.

Answer 1

The argument that best explains the charge of an atomic nucleus is:

An atomic nucleus is positively charged because it is composed of protons.

Protons carry a positive charge, while neutrons are neutral and do not contribute to the charge. Electrons, which are negatively charged, are not part of the nucleus but orbit around it. Therefore, the positive charge of the nucleus is due to the presence of protons.