Answer: A) Rowboat.
Step-by-step explanation: a noun is a word (other than a pronoun) used to identify any of a class of people, places, or things, or to name a particular one of these. A compound noun is a noun made up of two or more existing words. In the given sentence we can see an example of a compound noun in the word "rowboat" (corresponding to option A), because it is formed by the words "row" and "boat."