The correct option is B Climax community
Pioneer species or community are the first stage in ecological succession, consisting of species that are the first colonisers of the habitat. On bare rock the pioneer species is usually lichens.
Climax community is the last stage of ecological succession and does not change further. It is almost in equilibrium with the environment of the area where ecological succession occurred. It is the end of ecological succession and remains stable until the environment remains unchanged. For example, forest.
Seral communities are the individual transitional communities that appear and replace one another in ecological succession.
Hence the correct option is
b. Climax community