Answer: Option (a) is the correct answer.
Step-by-step explanation:
An organic compound that contains "-COOH" as the function group is known as carboxylic compound.
A carboxylic compound is an acid as it dissociates to give hydrogen ion.

Whereas a compound with functional group "-OH" is known as alcohol.
And, a compound with general formula RCOOR' is known as an ester.
Thus, we can conclude that the R-COOH compound behaves as an acid.