Read the passage:

Major cities all over the world are changing color. The tall buildings that make up the landscape of these urban environments are becoming greener. People are trying to help the environment and have found that green roofs are one way to do so. By planting grass and small shrubbery on the tops of buildings, the environment is getting a helping hand.

It is more expensive to build a green roof than it is to lay asphalt or shingles on a roof, but the trend is growing. The basic green roof requires a frame, waterproof membrane, gravel for drainage, fibrous material to retain moisture, soil for planting, and a barrier that prevents roots from penetrating the building.

Green roofs started in Europe and are now gaining a strong foothold in the United States. The largest green roof in New York City is built on the roof of a processing and distribution facility. It is actually the biggest green roof in the country. Being in New York, it has faced snow, rain, freezing, and thawing. It has survived it all.

Using information from the passage, what can you infer about green roofs?

A. Because of the green roofs in New York City, the environment is healthy.
B. If correctly built, a green roof can survive all kinds of weather.
C. The largest green roof in New York City is built on the roof of a processing and distribution facility.
D. When people build green roofs, they are going to plant flowers.