Highly recommend this video https://www.youtube.com/watch?v=pA7uv4gItGs

One of the tips mentions is why new information isn't necessarily automatically eliminated.

You might have made a similar mistake to me in missing some key words in the stimulus. It says that the cost for both processes is about the same if we don't include the cost to dispose of waste. And then it says that 1 process PRODUCES less waste than the other. I made the mistake, and read that as, it COSTS less for one process to dispose of waste than the other. So answer D is now clarifying the COST of disposing of waste.