Ms. Kohler has been receiving voice management each week since her otolaryngologist diagnosed bilateral vocal nodules six weeks ago. To document improvement, Ms. Kohler's SLP plans to compare several acoustic voice measures with those obtained at the time of the initial voice assessment. Which of the following acoustic signs would reflect vocal improvement?A. decreased amplitude perturbation (vocal shimmer)B. increased F2 frequencyC. Increased frequency perturbation (vocal jitter)D. Reduced energy of the first harmonicE. Increased turbulent energy

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