Correct Answer: Unsatisfactory

Solution : The correct choice is the second option.

Exemplary means that something is serving as a desirable model and that you think it is extremely good.

The meanings of the other words are as follows:

• Desirable: This word refers to something that is wanted or considered a good thing. 
• Unsatisfactory: This term describes something that fails to meet expectations or requirements.
• Flattery: Flattery is praise or compliments, often excessive or insincere, given to please or win a favour from someone.
• Imitative: This word refers to something that mimics or copies another thing, often lacking originality or creativity.

Therefore, among the options provided, the most appropriate antonym for exemplary would be unsatisfactory.