Question

many americans don’t feel safe riding bikes on busy streets. however, if the streets were more bike - friendly, people might be more willing to give up their cars. as americans become more aware of the dangers and costs of driving, more and more people are turning to this earth - friendly, healthy way to travel.
more americans have begun to bike because they’ve realized that
a driving is dangerous and expensive.
b bikes are easy to ride on the street.
c america has become very bike - friendly.
d speed limits are higher for bikes than cars.

Explanation:

The passage says "As Americans become more aware of the dangers and costs of driving, more and more people are turning to this Earth - friendly, healthy way to travel (biking)". Option A matches this. Option B: The passage says many don't feel safe biking on busy streets, so bikes aren't easy to ride on streets. Option C: The passage says "if the streets were more bike - friendly" (a hypothetical), not that America has become very bike - friendly. Option D: There's no info about speed limits for bikes and cars.

Answer:

A. driving is dangerous and expensive.