What words or sets of words fill the blanks and best fit the meanings of the sentences?

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Múltipla escolha | Preencha as lacunas | Forca

The imposition of heavy taxes on industries that emit toxic substances into the environment could prove to be an effective _______ to maintaining a clean, green earth.   apparition   incentive   deterrent   abeyance   appellation Hint Dica

Pergunta 1.