Refer to the Figure Shown

Refer to the figure shown.
Which ion is moving into the cell via diffusion and where is it located?

A) Na⁺ is diffusing into the cell at I.
B) K⁺ is diffusing into the cell at I.
C) K⁺ is diffusing into the cell at V.
D) Na⁺ is diffusing into the cell at V.