That looks like cells of a multicellular organism, so B.
<span>4.999999999999999e</span>+<span>24 this is what i got on the calculator but i dont know if its right.</span>
You multiply the number of atoms by 12 to get how many electrons (since each atom has 12 electrons in it)
you multiply the number of atoms by 13 to get how many neutrons
(since each atom of this isotope has 13 neutrons in it)