His sententious reply impressed the visitor.

The correct answer is: D. meaningful

A sententious reply is a reply that is full of meaning or significance. It is often used to express a deep or important thought. In the context of the question, the visitor was impressed by the speaker’s reply because it was meaningful and insightful.

The other options are incorrect because they do not accurately describe the meaning of the word “sententious.”

• Sharp means to be clever or witty. A sharp reply would be one that is clever or witty, but it would not necessarily be meaningful.
• Quick means to be done or said quickly. A quick reply would be one that is given quickly, but it would not necessarily be meaningful.
• Insipid means to be lacking in flavor or interest. An insipid reply would be one that is boring or uninteresting, but it would not necessarily be meaningless.