The overlooks the requirement that instructions must be repeated many times in order to be effective. If we don’t know the initial instruction is repeated many times, the author’s conclusion doesn’t follow.

The author never suggests a proportional relationship between repetition and effectiveness. Repetition is required in order for directions to be a effective, but that doesn’t mean the greater the repetition, the greater the effectiveness.

The author does not assume that hypnosis is the most effective technique for altering behavior. He asserts that hypnosis videos can work to change behavior, but never suggests that they are the most effective.

(D) describes circular reasoning. The author’s conclusion asserts that subsequent instructions on Mesmosis videos are extremely effective. This does not restate any supporting claim. There’s no other claim asserting that subsequent instructions are extremely effective.

The argument doesn’t rely on a claim that hypnosis videos have never been proven to be ineffective. The support for the conclusion concerns a description of the initial instruction and what is required for directions to a subconscious to be effective.