Concept:Darwin’s evolutionary theory is based on variation, competition, and natural selection, not on Lamarck’s idea of use and disuse.Explanation:Darwin proposed that individuals show variation, and organisms compete for limited resources.Those with favourable variations survive and reproduce, which is known as survival of the fittest or natural selection.The idea of “use and disuse” — that organs change because organisms use or do not use them — was proposed by Lamarck, not Darwin.Answer:C. Use and disuse