A biologist suspects that a polychaete worm uses active transport to remove a pollutant from its tissues. Evidence for this idea would be which of the following?

A、Anincreasedconcentrationofthepollutantattheexitsofitsexcretoryorgansasopposedtoinsideitstissues;
B、Presenceofexcretoryorgans;
C、Agreaterconcentrationofthepollutantinthesedimentoutsidethewormthaninsideofit;
D、Survivaloftheworminpollutedmud