[单选题]
A car enters a roundab7: i2tb)nq8 g;uolqcqjuh29si19 , w z7ofmv6pdzi+vout with a speed $v$. The dotted line shows the path of the car. The road is slightly banked at an angle to the horizontal.
The coefficient of friction between the tires of the car and the road is $\mu$. When $\mu$ decreases, which of the following changes could prevent the car from slipping away on this roundabout?
A. Banking angle of the turn increase; Speed of the car increase
B. Banking angle of the turn decrease; Speed of the car increase
C. Banking angle of the turn increase; Speed of the car decrease
D. Banking angle of the turn decrease; Speed of the car decrease
