The correct answer is D. Procerus.

The development of vertical glabellar frown lines is due to the overactivity of the orbicularis oculi, procerus and corrugator supercilaris muscles. These muscles function to pull the eyebrow inferomedially.  In this case, the injection is being performed near the glabellar midline directly into the procerus muscle belly.

The corrugator superciliaris is denervated with a paramedian glabellar injection.  Orbicularis oculi muscles can be denervated anywhere superiorly, laterally, or inferiorly to achieve the desired clinical response.  The frontalis muscle is injected higher on the forehead to relax transverse forehead lines.  The levator palpebrae superioris muscle is not targeted during cosmetic chemodenervation procedures.

References: Gart MS, Gutowski KA. Overview of Botulinum Toxins for Aesthetic Uses. Clin Plast Surg. 2016 Jul;43(3):459-71. PMID: 27363760

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