Junie is excited to go running on the city's newest running and bike trail. the brand new 3-mile trail runs right through the city and was built without tearing down any buildings at all. what is the most likely explanation of how the city planners accomplish the building of such a trail in a heavily developed urban area? view available hint(s)

junie is excited to go running on the city's newest running and bike trail.
the brand new 3-mile trail runs right through the city and was built without tearing down any buildings at all.
what is the most likely explanation of how the city planners accomplish the building of such a trail in a heavily developed urban area?

a. the trail is the urban growth boundary.
b. the trail was formerly a railroad line.
c. the trail was part of the original city plan.
d. the trail is a former farm.