(D) Hugo de Vries proposed the mutation theory of evolution. He conducted his experiments on the plant species $Oenothera$ $\text{lamarckiana}$, commo

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(D) Hugo de Vries proposed the mutation theory of evolution. He conducted his experiments on the plant species $Oenothera$ $\text{lamarckiana}$, commonly known as the $Evening$ $\text{primrose}$. Through his observations, he concluded that mutations are the raw material for evolution.