For a certain metal, incident frequency v is five times of threshold frequency v and the maximum velocity of coming out photoelectrons is 8×10⁶ ms⁻¹. If V =2 V₀, the maximum velocity of photoelectrons will be __
A. 6×10⁶ ms⁻¹
B. 8×10⁶ ms⁻¹
C. 1×10⁶ ms⁻¹
D. 4×10⁶ ms⁻¹