Respuesta :
Answer: A.
In an atom, protons and neutrons are in the nucleus, which is surrounded by electrons.
Explanation:
It must first be noted that an atom consists of protons, neutrons and electrons.
The proton and neutron is contained in the atom while the electron is found in the outer most shell of the atoms. It can be concluded then that in an atom, protons and neutrons are in the nucleus, which is surrounded by electrons.