Which pair below describes isotopes of the same element?

A. an atom 6 protons and 8 neutrons - an atom with 8 protons and 6 neutrons

B. an atom with 6 protons and 6 neutrons - an atom with 6 protons and 7 neutrons

C. an atom with 8 protons and 8 neutrons - an atom with 7 protons and 8 neutrons

D. an atom with 7 protons and 6 neutrons - an atom with 6 protons and 6 neutrons