Samantha helping Erin by holding her leg, first contracting the hamstrings and then stretching the hamstrings is called PNF stretching.
This is referred to as proprioceptive neuromuscular facilitation and is a stretching technique which is used to improve the muscle elasticity of the affected area.
This stretching technique involves partner's legs and contracting the hamstrings after which it is stretched then stretching the hamstrings. it has a positive effect on the range of motion and the muscle group present of the affected area.
It used to maintain and improve on the static flexibility of an individual which is why it is incorporated into flexibility training and exercises thereby making it the most correct choice.
Read more about Flexibility here https://brainly.com/question/1047464
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