The correct answer is 'c'
The purpose of this passage is to clarify what a UFO is. The passage tells you that even though UFOs often star in science fiction movies, most UFOs are actually aircraft, kites, clouds, meteors or rocket debris. It also cites a famous case in order to provide evidence for their claim.
Answer: I think it's Meter
Explanation:
In poetry, a stanza is a division of four or more lines having a fixed length, meter, or rhyming scheme.
Meter is the number and type of rhythmic beats in a line of poetry.
Rhythm is a part of the structure of a poem unless the poem is written in free verse.
Verse refers to a single line, a stanza, or the entire poem itself.