______ of the households in London owned a car in the early 1950s.

A．4) refers to ______.A. the London citizensB. those who commute to London from other placesC. managers who are anxious about their staff getting to workD. passengers who make complaints

A．overpopulation causes the problems in cities
B．two-thirds of the world' s population are living in cities today
C．it isn' t difficult to solve the problems faced by cities today
D．with fewer people, we would be free from any problems