Consider the Following Equation: GHG = × ×

Consider the following equation: GHG = × × GDP,
Where GHG = world annual emissions of greenhouse gases
Energy = world annual amount of energy consumed
GDP = world's annual gross domestic product
The ratio GHG/Energy describes

A) the units of greenhouse gases emitted per unit of energy consumed.
B) greenhouse gas emissions expressed as a percentage of carbon-based energy consumed.
C) the total units of greenhouse gases emitted annually.
D) the units of energy consumed per unit of greenhouse gases emitted.
E) the energy efficiency of greenhouse gas emissions.