What background knowledge would best add to a readers understanding of a website about recycling

Some background knowledge the readers should have on recycling for the best understanding is what products and materials should be recycled, what recycling means, and why it is important to recycle.

Hope this helps!

i believe the answer is: b. mr. head had a long, tube-like face with a rounded open jaw and a short depressed nose.

this is because in the un-revised sentence it said that mr. heads face was long and tube-like, and he had a rounded open jaw. this is not a very grammatically correct because of how it seems to drag on with the and, replaced with, with, makes it sound more fluent in the description.

the whisper is the answer, hope this : )