He was driving so fast as to get himself into a dangerous situation ________ he is likely to lose the control over his car.

1. A.
   why
2. B.
   where
3. C.
   how
4. D.
   which

He was driving so fast as to get himself into a dangerous situation ______ he is likely to lose the control over his car .

A．why                B．where              C．how                       D．which