The graphs below show the changes in crab color at one beach.

Which of the following is most likely to have caused the change in the distribution?
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A. A new predator arrived that preferred dark-tan crabs.

B. A new predator arrived that preferred light-tan crabs.

C. A change in beach color made medium-tan crabs the least visible to predators.

D. A change in beach color made medium-tan crabs the most visible to predators.