It is most likely B. An intransitive verb doesn't have an object, the action verb(cheered) is in front as well.
I know this isn't much help but just type the word followed by "definition" into google and you will get every possible meaning
A simile is defined as "<span>a figure of speech involving the comparison of one thing with another thing of a different kind, used to make a description more emphatic or vivid" Based on this, it might be said that there is a comparison between the narrator and two birds. It might be understood that he tends to use things from other people and he gives them credit for. </span>
