Question

in some locales, wildlife overpasses and underpasses are designed specifically for the kinds of wildlife that need them. in amherst, massachusetts, wildlife professionals built tunnels for spotted salamanders to cross under city streets. in powys, wales, the city council designed ditches and tunnels to lead toads to their breeding grounds and keep them off the roads. in kenya, there is even an underpass for elephants. on christmas island, in australia, red crabs migrate to the beach to breed, often crossing highways and roads. to protect this flood of creatures, wildlife biologists and civil engineers have designed crab tunnels and crab bridges to funnel the crabs to the beaches and keep them off the roads. the author includes details about red crab breeding grounds in order to a describe an example b criticize an argument c present a solution d introduce a new topic

Explanation:

The passage lists various examples of wildlife - friendly infrastructure. The details about red crab breeding grounds are part of this series of examples, showing how special structures are built to protect migrating wildlife.

Answer:

A. describe an example