Which of the following structures $(A-D)$ correctly represents a basic amino acid?

  • A
    Option A
  • B
    $\text{NH}_2-\text{CH}(\text{COOH})-(\text{CH}_2)_4-\text{NH}_2$ (Lysine,a basic amino acid).
  • C
    $\text{CH}_2(\text{OH})-\text{CH}_2-\text{CH}_2-\text{NH}_2$ (Not an amino acid).
  • D
    $\text{NH}_2-\text{CH}(\text{COOH})-\text{CH}_2-\text{OH}$ (Serine,a neutral amino acid).

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