His tardy manners were a great impediment in the path of his success.

The correct answer is C. sluggish.

The word “tardy” means “late or slow.” In this sentence, it is being used to describe the man’s manners. His tardy manners were a great impediment in the path of his success because they made him appear unreliable and unprofessional.

The other options are not correct because they do not describe the man’s manners.

• Quick: This word means “fast.” It does
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  not describe the man’s manners.
• Enthusiastic: This word means “showing or feeling great interest or excitement.” It does not describe the man’s manners.
• Progressive: This word means “moving forward or developing in a positive way.” It does not describe the man’s manners.