Kala said to Radha, “who were you speaking to over the phone?”

A. Kala asked Radha who she had been speaking to over the phone.
B. Kala asked Radha who she has been speaking to over the phone.
C. Kala asked Radha that who she was speaking to over the phone.
D. Kala asked Radha that who she had been speaking to over the phone.