The correct answer is B. Good communication with partner
Step-by-step explanation:
Stretching involves flexing one of more muscles in the body, this is recommended as part of the exercise to make muscles flexible and strong. In the case of passive stretching, there is an external force such as a machine or person that helps you stretch while you remain in a static and relaxed position. In the case of working with a partner, it is important to have good communication, in this way you can let him/her know the range of appropriate stretch for your body to avoid possible muscular injuries due to overstretching. Thus, an essential component of safe passive stretching is "Good communication with partner".