Passage:

A transport analyst challenges the claim that expanding highways always reduces congestion. While added lanes may briefly ease traffic, the analyst notes that easier driving conditions often encourage more people to travel by car, move farther from work, or take trips they previously avoided. Over time, traffic volumes rise until delays return. The analyst argues that this pattern shows congestion is not merely a supply problem but a behavioral response to perceived convenience.

Which choice best explains the cause–effect relationship described?