Sponges Move Huge Volumes of Water Through Their Bodies Every

Sponges move huge volumes of water through their bodies every day. Although this serves the function of filter feeding for the organism, how might this also provide an "ecosystem" service (something that affects and/or benefits other organisms in their environment) ?

A) They can filter small poisonous fish out of the water that may harm other organisms.
B) They create small currents in their microenvironment that help to circulate and clean water locally for other organisms.
C) They produce large numbers of gametes that will become food for other sponges.
D) Their body chambers serve as places where smaller organisms can live and be protected from certain predators.