Which one of the following is a basic amino acid ?

Options

A. `H_(2)N-underset(underset(NH)(||))(C)-NH(CH_(2))_(3)-overset(overset(NH_(2))(|))(CH)-COOH`
B. `HOH_(2)C-underset(underset(COOH)(|))(CH)-NH_(2)`
C. `underset(underset(COOH)(|))(CH_(2))-CH_(2)-overset(overset(NH_(2))(|))(CH)-COOH`
D. `HOOC-CH_(2)- overset(overset(NH_(2))(|))(CH)-COOH`

Answer

A

Explanation

Since in `(A)` the number of amino groups is more than that of carboxylic groups. Therefore it is basic.