Correct Option: D

relieve (Verb) : to remove or reduce an unpleasant feeling or pain; alleviate
harass (Verb) : to worry or annoy somebody by putting pressure on him or saying or doing unpleasant things to him
reward (Noun) : a thing that is given for doing something good, working hard etc.
praise (Verb) : show approval of or admiration for somebody/ something
flatter (Verb) : to say nice things about somebody in a way that is not sincere, because you want him to do something for you or you want to please him