43. What can be inferred based on the information in this passage?
(A) Fossil fuels are the most efficient energy options.
(B) The invention of the car is the cause of CO2 emissions.
(C) Horse-drawn carriages can reduce carbon-emitting fuels.
(D) It is inefficient to rely on solar and wind power.

此篇主旨是在說：造成地球暖化的原因不完全...