Vamos analisar as opções: A. ( ) 0 < x < d : ; d < x < 4d/7 : ; 4d/7 < x < 2d : ; 2d < x < 3d : B. ( ) 0 < x < d : ; d < x < 2d : ; 2d < x < 7d/3 : ; 7d/3 < x < 3d : C. ( ) 0 < x < d : ; d < x < 3d/4 : ; 3d/4 < x < 2d : ; 2d < x < 3d : D. ( ) 0 < x < d : ; d < x < 4d/7 : ; 4d/7 < x < 2d : ; 2d < x < 3d : E. ( ) 0 < x < d : ; d < x < 7d/4 : ; 7d/4 < x < 2d : ; 2d < x < 3d : Analisando as opções, a alternativa correta é a letra C. ( ) 0 < x < d : ; d < x < 3d/4 : ; 3d/4 < x < 2d : ; 2d < x < 3d :
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