The question asks us if Center 1 is the only recycling center than recycles wood, which of the following could be a complete list of materials that one of the recycling centers recycles?
We can infer that:
Center 1 must recycle wood newsprint glass Center 2 must recycle newspaper glass Center 3 must recycle plastic tin
Center 3 could also recycle newsprint thus either:
plastic tin plastic tin newsprint
are both possible scenarios, so either one could be the correct answer choice for a "could be true" question.