If You Were Told to Sort Cards to into Boxes

Multiple Choice

If you were told to sort cards to into boxes after a lab on elements,you would put into a slot labelled "Mass Number" any card with text that meant

A) the total number of protons,neutrons,and electrons of an atom.
B) the total number of protons and electrons of an atom.
C) the total number of protons and neutrons of an atom.
D) the total number of neutrons and electrons of an atom.
E) the total number of protons of an atom.