1) Explanation

Let's break down the sentence blank by blank, looking for logical consistency and clues from the surrounding context. The sentence describes a supplement's claim, its actual effect, and the bodybuilder's conclusion.
- Blank (i): "The packaging of the revitalization supplement (i) $\qquad$ that the user would feel an increase in energy within a week of taking it,..."
- A "revitalization supplement" is designed to increase energy. The packaging would make a claim or promise about this effect.
- A. dissembled: Conceal one's true motives, feelings, or beliefs. This implies deception, which might be true of the supplement, but "dissembled that" is grammatically awkward and doesn't fit the direct claim.
- B. adumbrated: Report or represent in outline; foreshadow. This means to give a vague indication, not a direct claim.
- C. averred: State or assert to be the case. This perfectly fits the idea of the packaging making a direct claim or promise.

So, Blank (i) is C. averred.
- Blank (ii): "...but the bodybuilder actually felt more (ii) $\qquad$ than usual."
- The word "but" signals a contrast. The supplement promised an "increase in energy," so the bodybuilder must have felt the opposite.
- D. innervated: Supply (an organ or body part) with nerves; stimulate (a nerve, muscle, or organ) to action. This implies increased energy or stimulation.
- E. enervated: Cause (someone) to feel drained of energy or vitality; weaken. This is the direct opposite of "increase in energy" and fits the contrast perfectly.
- F. quickened: Make or become quicker or faster; make or become more lively. This implies increased energy.
So, Blank (ii) is E. enervated.
- Blank (iii): "After he stopped taking the supplement, he felt normal again, leading him to (iii) $\qquad$ that he was allergic to something in the vitamins."
- The bodybuilder felt normal after stopping the supplement, which led him to a conclusion or theory about why he felt enervated.
- G. postulate: Suggest or assume the existence, fact, or truth of (something) as a basis for reasoning, discussion, or belief. This fits the act of forming a hypothesis or conclusion based on observation.
- H. contravene: Violate the prohibition or order of (a law, treaty, or code of conduct); conflict with (a right, principle, etc.). This is irrelevant.
- I. exult: Show or feel elation or jubilation, especially as the result of a success. This describes a feeling, not the act of forming a conclusion.

So, Blank (iii) is G. postulate.

Putting It Together:
"The packaging of the revitalization supplement averred that the user would feel an increase in energy within a week of taking it, but the bodybuilder actually felt more enervated than usual. After he stopped taking the supplement, he felt normal again, leading him to postulate that he was allergic to something in the vitamins."

This completed passage creates a coherent narrative of a supplement's failed promise and the user's logical deduction.

The final answer is $\(\mathrm{C}, \mathrm{E}, \mathrm{G}\)$.