Identify the Lewis Acid in the Following Reaction:
PH₃(g) $\rightarrow$ PH₄⁺(g)
A) PH₃
B) H⁺
C) PH₄⁺
D) None of H⁺(g)

Identify the Lewis acid in the following reaction:
PH₃(g) + H⁺(g) $\rightarrow$ PH₄⁺(g)

A) PH₃
B) H⁺
C) PH₄⁺
D) None of these is an acid.
E) All of these are acids.