Which of the following variations of a hop exercise would be the most difficult from a deceleration and balance standpoint?

Select one:

a$.$

Single$-$leg hop forward

b$.$

Multiplanar hop with stabilization

c$.$

Multiplanar single$-$leg box hop$-$up with stabilization

d$.$

Multiplanar single$-$leg box hop$-$down with stabilization