Please read the stimulus material below that relates to the question that follows.
Mr. Trainer teaches high school physical education and also coaches the track and field team at the high school. Some of his track athletes, under his supervision, perform some stretches in a hurdle position and almost seem to bounce as they lean forward into the stretch repeatedly. Mr. Trainer also has some of these students in physical education class. While in PE class, he will not allow them to stretch that way.
In Mr. Trainer's physical education class, what stretching technique was probably taught at the beginning of the school year?
A. Static; it is safe and effective
B. PNF; it is safe, effective, and simple
C. Dynamic; it is most appropriate for older adolescents
D. Passive; it requires a partner and is the safest way to stretch