Manganese has 2 (two) electron that would free floating and able to form a metallic bond.
The electronic configuration of manganese is (Ar) 3d5 4s2. The two electron in 4s orbital are the valence electron which can freely move from one place to another.
I think the answer is A because it’s a better explanation
If it's Kepler's law of equal areas you're talking about,
then the first of the four statements is true.