The correct option is B diapause
Under unfavourable conditions, many zooplankton (free floating aquatic microbes) species in lakes and ponds are known to enter diapause, a stage of suspended development.
Hibernation is a state of minimal activity among animals (like bears) during winters.
Aestivation is a state of minimal activity among animals (like desert lizards) during summers.
Migration is movement of organisms like arctic tern from one place to another during harsh weather conditions.