Answer:- A. amine, aromatic ring, amide, ester and carboxylic acid.
Explanations:- -COOH is present which is known as carboxylic acid group. -NH2 is also present and it is known as amine group. -CONH- is also present and it is known as amide(there is double bond between C and O of amide group). -COOCH3 is present and it is knonw as ester group(double bond between C and O and other O is bonded to the carbon with a single bond). Six carbon ring is present and it has three conjugated double bonds, it is known as aromatic ring.
It's not a phenol as -OH is bonded to the ring directly. It's not a ketone as all the three C=O are the parts of carboxlic, amide and ester groups.
Similarly there is no alcohol group as the OH is a part of carboxylic group and it's not individual present there.
Nitrile is not present as it doesn't have a triple bond between C and N. It's also not ether as there is no R-O-R present in the structure. The one that we have is a prat of ester group.
