American folk art flourished in the eighteenth and nineteenth centuries when folk artists created a variety of <u>phenomenal objects</u>.
<h3>What is a word?</h3>
A word refers to a unit of language which comprises one or more spoken sounds and alphabets that connotes a thing, action, event, etc.
In this scenario, we can logically deduce that the most appropriate words to complete the sentence is phenomenal because it connotes being exceptionally good.