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

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