In bacteria, fungi and lower plants, various of thick-walled ...$A$... are formed, which help them to survive ...$B$... conditions-these germinate on availability of suitable environment. In higher plants ...$C$... and some other vegetative reproductive structures serve as means to tide over periods of stress besides helping in dispersal-they germinate to form new plants under favourable moisture and temperate conditions

Choose the correct option for $A, B$ and $C$