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.