According to experts, which of the following is NOT an explanation for the recent increase in bicycle use in London?

According to the experts, which of the following does not explain the recent increase in bicycle use in London?

Answer B: people have more money, so they can buy good bikes.

The remaining answers:

A. People want to keep fit.

C. Traveling by car is usually slower than by bicycle

D. Cycling protects the environment

Information in the article:

Experts say there is a mixture of reasons for this boom: concerns about the environment, the desire to keep fit, and also the fact that cycling is often not only cheaper but also quicker than traveling by car:

Experts say there is a mixture of reasons for this boom: environmental concerns, the desire to stay fit, and also the fact that cycling is often not only cheaper but also faster than traveling by car.