Which of the Following Statements Concerning Natural Gas Is Not

Which of the following statements concerning natural gas is not true?

A) Gas-fired power plants emit up to 40% less carbon dioxide than coal-burning power plants.
B) 70-95% of natural gas consists primarily of ethane (C₂H₆) .
C) Combustion of methane does not produce ash.
D) Large amounts of methane exist in the oceans because methane hydrates.
E) Natural gas is found deep under the Earth's surface.