Answer:
A. one aluminum atom and one phosphorus atom.
Step-by-step explanation:
One aluminum atom and one phosphorus atom will create an octet for each atom because one aluminum atom have 3 valence electrons in its outermost shell and one phosphorus atom have 5 valence electrons in ar aits outermost shell. And, 3 + 5 = 8, which is the number of electrons needed in the outermost shell of the atom of an element for it to be stable.