An Esthetician Is an Expert in Skincare

Multiple Choice

An esthetician is an expert in skincare. Marla is an esthetician and she recommended that I use this medicated acne soap, so that soap is certain to improve the quality of my skin.
Which of the following is a flaw in the above passage?

A) It mistakes professional qualifications on one subject for knowledge on another subject.
B) It assumes that Marla's professional qualifications are valid.
C) It presumes, without providing justification, that Marla has direct experience working with acne sufferers.
D) It presumes that improving acne improves skin quality.
E) It mistakes something being likely as being a certainty.