I think b. and d. could be the answer
Well Olivia, Sophia, her older brother and his friend are in a bit of a pickle. I suggest Olivia and Sophia brake the computer, resulting in no one to be able to use it.
Dynamic Warm-up:
A good dynamic warm-up is jumping jacks. You jump up, land with your legs about shoulder width apart and arms up, jump again and land with your arms down and legs together, and repeat those steps!
Static cool down:
And good static cool down is low lunges. You step out really far and lean into your leg, while the other stretches out behind you. Dot the same with other leg, and repeat a few times!
