He felt gratified to the old man for his help.

The correct answer is A.

Gratified means feeling pleasure or satisfaction as a result of one’s own achievements or good fortune.

Depressed means feeling very sad or unhappy.

Discouraged means feeling less hopeful or confident about the success of something.

Distressed means feeling very worried or upset.

Frustrated means feeling annoyed or impatient as a result of being

In this case, the old man helped the person, so the person would feel grateful to the old man.