You didn't provide any examples, however, the most famous metrical foot in English is the Iamb which was used by almost all writers at a certain point in time, most famous one being Shakespeare. It consists of an unaccented syllable followed by an accented one.
Find out the hidden meaning of the story
I believe the answer is D. but I am not 100% sure.
The correct answer is to provide a context clue for "over the moon."
So we know that the boy was over the moon, that he was very happy because of something that previously happened. Obviously, we want to know the reason why he was so over the moon, and by adding the information that his essay won first place, we got that context we were previously lacking.
