Answer:
B. physical therapist
Step-by-step explanation:
The physical therapist is the specialist in muscle and movement that people go to about stretching exercises and to receive treatment for their recovery. The therapist will be able to provide the best exercises to facilitate and accelerate the recovery after an injury or an accident.
The personal trainer and fitness manager are good resources to develop general capacity and muscles, but they don't have medical training and don't have your medical file... so they might actually do you more harm than good.
The nutritionist will help you eat right, but cannot help you with your stretching.