What is the correct order of reactivity of carboxylic acid derivatives towards nucleophilic acyl substitution?

  • A
    $R-CO-X > R-CO-O-CO-R > R-CO-OR > R-CONH_2$
  • B
    $R-CO-X > R-CO-O-CO-R > R-CO-OR > R-CONH_2$
  • C
    $R-CO-OR > R-CONH_2 > R-CO-X > R-CO-O-CO-R$
  • D
    $R-CO-O-CO-R > R-CO-OR > R-CO-X > R-CONH_2$

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