about approach velocity in questionimaze

Question

At an instant particle-A is at origin and moving with constant velocity (3i + 4j) m/s and particle B is at (4,4) m and moving with constant velocity (4i - 3j)m/s. Then at this instant:

(A) Relative velocity of B w.r.t A is (i - 7j) m/s

(B) approach velocity of A and B is 3√2 m/s

(C) Relative velocity of B w.r.t A remains constant.

(D) approach velocity of A and B remains constant.

Answer 1

If we are to choose the incorrect option the answer will be (b)