A bouquet of flowers __________ on the table.

This question tests your understanding of subject-verb agreement, particularly with phrases that include a collective noun or a noun followed by 'of' and a plural noun. The key to correctly answering this question lies in identifying the true subject of the sentence. In the phrase 'A bouquet of flowers,' the head noun, and thus the grammatical subject, is 'bouquet,' which is a singular noun. The phrase 'of flowers' acts as a prepositional phrase modifying 'bouquet' and does not determine the number of the verb. Since 'bouquet' is singular, the verb must also be singular. Therefore, 'is' is the correct choice for the verb. Options 'are' and 'were' are plural verbs, and 'have' is also plural, making them incorrect. The sentence correctly reads, 'A bouquet of flowers is on the table,' demonstrating proper subject-verb agreement with the singular subject 'bouquet.'