GMAT Critical Reasoning (CR) | Re: Preservatives known as parabens function like weak versions of the hor

Preservatives known as parabens function like weak versions of the hormone estrogen. These artificial estrogens are commonly added to cosmetic products used on hair and skin. Some cosmetics manufacturers refrain from using parabens in their products. Consequently, consumers who have adverse reactions to externally-applied hormones can safely use these paraben-free products without risking their health.

Which of the following is an assumption on which the argument depends?

A These cosmetics manufacturers