TOEFL Reading: ETS-TOEFL阅读机经 - I3W04_ORNG6303JKL$

According to paragraph 2, how do fast-growing branching corals defend themselves from attacks by slower-growing corals? A. By producing stinging sweeper tentacles B. By growing on top of the slower-growing corals C. By blocking the light to the slower-growing corals D. By destroying the stinging filament of the slower-growing corals