How have you been getting on with your enquiries (sự điều tra)?

How have you been getting on with your enquiries (sự điều tra)?
1 điểm
A. How much progress have you made for your enquiries?
B. How much progress have you been making for your enquiries?
C. How much progress have you made with your enquiries?
D. How much progress have you been making with your enquiries?