what is the shortest path from R6 to R5?

— Exhibit –

— Exhibit —
Click the Exhibit button.
Referring to the exhibit, what is the shortest path from R6 to R5?

A.
R6, R4, R2, R1, R3, R5

B.
R6, R4, R2, R3, R5

C.
R6, R4, R5

D.
R6, R5