What happens to the car if it is traveling in a circular path suddenly encounters ice?
a.) the car's friction is reduced to zero.
b.) the car's centripetal force drops to zero.
c.) the car continues in a straight path from the point at which it encountered the ice.
d.) the car continues in a circular path from the point at which it encountered the ice

When a car is travelling in a circular path then for the circular motion of the the centripetal force is provided by the friction force

This friction force will help to take turn in circular path

Now during the motion of car if friction suddenly disappear due to which there is no centripetal force will act on it

Since there is no centripetal force on the car so now it will not be able to take turn

so here is the possible outcomes

A.) the car's friction is reduced to zero.  

B.) the car's centripetal force drops to zero.  

C.) the car continues in a straight path from the point at which it encountered the ice.

it doesn't. it was imagined up in the middle ages.