I'm not sure I understand the question, but the grammatically correct answer is A.) Louder.
Verbs are action that can be mental or physical. Adjectives are words that describe something in detail.
Darwin's argument tells us that species develop their traits through natural selection due to competition, survival and reproduction. Diversification of species is an important part to make his argument valid because diversification suggest extinction of specie if it doesn't survive.
B
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