1. C. you are reusing, because instead of throwing the couch away, you gave it to someone who will "reuse" it.
2. I'm not sure, but I would say B. recycling. Repurposing things that you have no use for limits how much waste there is and how much must be manufactured. This reduces pollution and limits the burden on the environment.
3. A. is the answer, it is pre-consumer waste because the waste is from the manufacturing process. The waste is not from the consumer(whoever buys the product) so not B. and I doubt it is C. or D.
4. A. is the answer. Burning waste produces greenhouse gasses. B. can't be true, because the gasses from the burning are not the raw material. C. and D. couldn't be the case because water was not present in the disposal.
5. is A. compost center because they only take green waste.
6. A. the orange peal is the only option that is biodegradable.