If you that you are new to the OLQB so it is a good time to let you know that these are genuine exam questions written by the JAA for the ATPL (A) exams. We have nothing to do with their construction or the given answers.

Sometimes we don't agree with the given answers but that's what the examiner has decided is correct.

Here the question asks about the drag curve. The bottom of the drag curve is Vmd where CD:CL is it a minimum and where CL:CD is at a maximum. The tangent to the drag curve is 1.32Vmd.