Researchers put two electrodes in a pool that a dolphin swam in. When the dolphin swam near the electrodes, the researchers would sometimes create a weak electric field by activating the electrodes. The dolphin would swim away if the electrodes were activated; otherwise it acted normally. The researchers then placed a plastic shield over small organs called vibrissal crypts located on the dolphin' s snout. With the crypts covered, the dolphin no longer swam away when the electrodes were activated. The statements above, if true, most strongly support which one of the following?
A: In the wild, dolphins sometimes encounter strong electric fields.
B: Under normal circumstances, dolphins are unable to sense electric fields.
C: Vibrissal crypts enable dolphins to sense electric fields.
D: Electric fields interfere with the normal functioning of dolphins' vibrissal crypts.
Choose A, B, C or D as your solution.
C