Step 1: Understanding the amino acids.
Among the amino acids listed, alanine has the lowest molar mass. The molecular weights of the amino acids are:
- Alanine: 89.1 g/mol
- Aspartic acid: 133.1 g/mol
- Arginine: 174.2 g/mol
- Asparagine: 132.1 g/mol
Step 2: Conclusion.
The correct answer is (A) Alanine because it has the lowest molar mass compared to the other amino acids listed.