Answer C is the correct answer and acknowledges that some ducks may starve. Answer A is inaccurate, because cooperation amongst members of a population is very rare. Answer B implies that an individual is capable of changing to meet needs. Answer D makes the mistake of assuming that it is always the biggest and strongest ducks that will get the most food. In reality, the ducks with a slightly different beak, or a slightly more efficient metabolism could have a competitive "edge".
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