Spotted deers are endowed with bright dots, and the most popular subspecies has the largest dots. The dots cannot act as camouflages for these open land grazers, due to their prominence. There is therefore some ecological reason for such bright spots. The dots must therefore be of importance to the species as the spots must be acting as some sort of signal to the deer. Which one of the following, if true, most strongly supports the conclusion regarding a signaling function?
A. Exceptional size and vigor also mark the subspecies of deer characterized by the best-defined dots
B. Grazing animals with a coat of uniform color may be harder to spot than spotted deer in certain tall grasses.
C. A temporary change of color easily can be perceived by the other members of the species, marking a visual signal in the most prevalent species of deer.
D. Deers respond much faster to moving shapes that have dots than they do to moving shapes that are otherwise identical but without dots.
E. Deers give several kinds of vocal signals than do similar species such as horses.
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66% (01:38) correct 
