The answer which describes this line from The Little Brown Bat's poem about the owl is that A. it is written in iambic pentameter.
This means that there are five meters (= 10 syllables) in the line, and that the first syllable is unstressed, and the one that follows it is stressed.
It cannot be a rhyming couplet because there are no rhymes. It's not a limerick, because that is a whole poem consisting of five lines. It is not in free verse, because it has a regular meter - pentameter.
