Answer:
Option B, Foundation species
Step-by-step explanation:
Foundation species are the one that play a major role in creating and maintaining the habitat. These species support other species and can fit in at any trophic level of the food chain.
These species are also referred as ecosystem engineer as they contribute in designing the ecosystem.
Some examples of foundation species are - Corals, Earthworms, Beavers etc.
Hence, option B is correct