Mark the letter A, B, C or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions.
a. The burning of wood for heating purposes is likely to produce little in the way of carbon emissions and is therefore considered to be friendly to the environment.
b. Wood and coal are both useful sources of energy, and both are constantly in use around the world.
c. Coal, on the other hand, is termed the "enemy of the environment" as it is the largest source of carbon emissions and is the greatest contributor to global warming.
d. This is because wood burning produces only as much carbon as if the tree were left alone to eventually rot in the ground.
e. However, while they each have their merits as fuel, the problems and hazards associated with their use are very different.