Which phrase from the paragraph best helps the reader understand the meaning of the underlined word?

The man who takes care of our yard sprayed the lawn with ammonia. It’s a fertilizer to help the grass grow. Ammonia is a colorless, strong smelling, liquid gas. It’s a substance made of two or more elements. The elements in the
compound are nitrogen and hydrogen.

A.
a fertilizer to help the grass grow

B.
the man who takes care of our yard

C.
a substance made of two or more elements

D.
a colorless, strong smelling, liquid gas


compound is the underlined word .