When you read, you benefit by using the same skills that a doctor uses when diagnosing patients.

the answer is b. the tomb is underground and dark, and its opening is covered by a heavy grate.

cause they were to dumb to get their college education to become a real   : )

"urban sprawl, the spreading of large developments of housing and shopping areas around a city’s center, has many negative cultural and environmental effects. " (from your link)

so, your answer is: it has a negative effect on the environment, otherwise known as c~hope this mate.