The term that is false would be B.
Betty should not go swimming immediately, the waters might not be safe and if she is alone, no one would be able to help her if something went south.
<span>Flexible joints are A. important to prevent athletic injury. It is quite important to stretch and warm up before exercising so as not to hurt yourself and your body and muscles. Flexibility is relevant for everyone, not just cross-training athletes. It doesn't occur naturally, you have to train to get there. It is important for everything, not just running. </span>
