Which of the following significantly influenced Darwin's development of his natural selection theory?

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Lamarck's concept of acquired trait inheritanceMalthus's work on population dynamicsMendel's research on pea plant geneticsDe Vries's mutation theory

Explanation

Among the listed options, De Vries's mutation theory had a notable impact on Darwin's formulation of natural selection. While Lamarck proposed inheritance of acquired traits, Malthus wrote about population pressures, and Mendel studied genetics, it was De Vries's mutation theory that directly influenced ideas about variation and evolution.