If the wheel of a car makes four complete rotation and half a turn, then the number of right angles through which it turns is:

The correct option is B

18

Each complete rotation of the wheel = 360${}^{\circ }$.
There are 4 right angles in 360${}^{\circ }$.
Hence 4 complete rotation will have 4 $\times$ 4 = 16 right angles.
Half a turn = 180 ° i.e 2 right angles,
Hence the total number of right angles through which the car wheel turns is = 16 + 2= 18.