When a neutrally charged atom loses an electron to another atom, the result is the creation of two ions (cation and anion).
It would be C, because Ionic bonds have to deal with valence electrons ( the outer shell ones)
I don't know this article, but I do know some major changes: first, the change from the plum pudding model (no nucleus, just electrons) to the gold foil experiment, which had Rutherford shoot alpha particles at a sheet of gold only to find them rebounding, proving the existence of a positively charged mass, i.e a nucleus, in the atom. However, this changed again when Bohr realized that the negatively charged electrons should be attracted to the positively charged center, so that there must be something else inside the nucleus.
I mostly believe in between D and B beacuse K3po4 and caco3 is not an element equation