Choose the principle of green chemistry which states that raw materials or starting materials should be replenishable rather than depleting wherever technically and economically practicable.

Principle 7 of green chemistry, "Use of renewable feedstocks", states that raw materials should be renewable rather than depleting where practicable. Atom economy concerns how many reactant atoms end up in the product and designing safer chemicals concerns product toxicity; neither is about the source of raw materials.