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 - Chris: We should definitely try to use energy-saving devices.
b - Bob: I'm supposed you're right. Shall we write down our proposals for the project? c- Chris: I'm not sure about that. They are expensive. Perhaps we could plant trees.
d - Bob: Chris, we need to come up with some ideas about how to protect our ecosystems. What do you suggest we do?
e - Bob: Ok. We could also use electric cars.