Identify the Lewis Base in the Following Reaction: PH₃(aq)+ H⁺(aq) $\to$

Identify the Lewis base in the following reaction: PH₃(aq) + H⁺(aq) $\to$ PH₄⁺(aq)

A) PH₄⁺
B) H⁺
C) PH₃
D) None of these is a base.
E) All of these are bases.