Hint : Amino acids are classified as acidic, basic or neutral depending upon the relative number of amino and carboxyl groups in their molecule.
Step 1 : Definition of basic amino acids Basic amino acids are the amino acids which have more number of amino than carboxyl groups making it basic.
Step 2: Structures of given amino acids
Lysine :
Proline :
Alanine :
Aspartic acid :
Step 3 : Example of basic amino acids
Some basic amino acids are - lysine, arginine, histidine etc.
Final Answer : Correct answer (A) Lysine, which is a basic amino acid.
Proline : 
Alanine : 
Aspartic acid : 
Step 3 : Example of basic amino acids
Some basic amino acids are - lysine, arginine, histidine etc.
Final Answer : Correct answer (A) Lysine, which is a basic amino acid.