Recycling paper is an important process that helps save trees and reduce waste. First, old paper products like newspapers and magazines are collected. Next, they are sorted and cleaned to remove any non-paper items. Then, the paper is shredded and mixed with water to create a pulp. This pulp is then pressed and dried to form new sheets of paper. Finally, these new paper products are ready to be used again. Which of the following steps is crucial for ensuring the quality of the new paper products?
A) Collecting old paper products.