The explanation for the dolphin die-off given by the research team most strongly supports which one of the following? A. The biological mechanism by which brevetoxin affects dolphins is probably different from that by which it affects other marine animals. B. When P. brevis blooms in an area where it does not usually exist, it is more toxic than it is in its usual habitat. C. Opportunistic bacterial infection is usually associated with brevetoxin poisoning in bottlenose dolphins. D. The dolphins' emaciated state was probably a symptom of PCB poisoning rather than of brevetoxin poisoning. E. When a dolphin metabolizes its blubber, the PCBs released may be more dangerous to the dolphin than they were when stored in the blubber.