Refer to the Following Choices to Answer the Questions Below

Multiple Choice

Refer to the following choices to answer the questions below. Choose the answer that best describes the chemical composition of the object.
-Earth's atmosphere

A) nickel and iron
B) 80 percent nitrogen, 20 percent oxygen
C) 95 percent carbon dioxide
D) mostly hydrogen and helium
E) frozen methane, ammonia, water, and other gases and dust