People think that traffic congestion in the downtown area is due to the increasing number of private cars.

A. Traffic congestion in the downtown area is thought to result in the increasing number of private cars.

B. Traffic congestion in the downtown area is blamed for the increasing number of private cars.

C. The increasing number of private cars is attributed to traffic congestion in the downtown area.

D. The increasing number of private cars is thought to be responsible for traffic congestion in the downtown area.