He said to Sita, "When do you intend to pay back the money you borrowed from me?"

• A. He enquired Sita when did she intend to pay back the money she borrowed from him
• B. He enquired Sita when she intended to pay back the money she borrowed from him
• C. He enquired Sita when she intended to pay back the money she had borrowed from him
• D. He enquired when Sita intended to pay back the money she borrowed from him