What is the number of $-COOH$,$-NH_2$,$-H$,and $-R$ groups respectively in the structure of an amino acid?

  • A
    $1, 1, 1, 1$
  • B
    $1, 2, 1, 1$
  • C
    $1, 1, 2, 1$
  • D
    $1, 1, 1, 2$

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