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

Answer: Option A

Tardy : delaying or delayed beyond the right or expected time; late.
Quick : moving fast or doing something in a short time.
Enthusiastic : having or showing intense and eager enjoyment, interest, or approval.
Sluggish : slow-moving or inactive.
Progressive : happening or developing gradually or in stages.

Antonym of Tardy is Quick