Where is the most common blind spot for a passenger car, truck, or van?

Select one:

a$.$ On the vehicle's right side, from just behind the vehicle up to the back third of the vehicle

b$.$ On the left side of the vehicle, only, extending from just behind the driver$-$side door to a full length behind the vehicle

c$.$ Directly even with the driver on both sides of the vehicle and extending a full car length behind the vehicle

d$.$ Only big trucks have blind spots; it's rarely an issue for passenger vehicles