The correct answer is satisfy.
B. promote to highest rank
C. install endcap of metal bars
D. leave gratuity
The correct answer is (A) To satisfy; to give pleasure to; Also, to indulge, humor.
Gratify comes from Middle English gratifien, French gratifier, Latin gratificare (to please).
Examples of use:
- The politician was gratified with his reception.
- They were gratified with the response to their advertising.