He said to me, “Are you going to karachi”?

(A) He told me if I was going to Karachi. (X)
(B) He asked me if I was going to Karachi.(✔) 
(C) He said to me if I am going to Karachi. (X)
(D) He asked me if I am going to Karachi. (X)

Answer: He asked me if I was going to Karachi.