Respuesta :
The answer to your question would be that the simple subject of the sentence is the following one: Taylor, Kevin, and Brenda.
A simple subject is a main word or words that tell what or whom a sentence discusses, not including any modifiers. In order to identify the subject of the sentence, you can ask who have been working hard on their project for the science fair? The answer is the subject of the sentence: Taylor, Kevin, and Brenda.
