Answer: c. dynamic constant external resistance training
Step-by-step explanation:
The dumbbell lunge is a exercise which is done by a single leg. It increases the strength of the body. It improves the stability of the body and develops the speed of the lower body. It is done along with dumbells held on hands and lying down with lower knee down.
C. is the correct option this is because of the fact that it involves both lifting as well as concentric phase as well as in lowering or eccentric phase.