What is Mr. Moon assessing by asking kindergarten children about features in a book?

Mr. Moon is assessing children's understanding of print awareness by asking them about features in a book. Print awareness encompasses knowledge of the basic concepts regarding the function and format of print, such as recognizing the front and back covers, understanding that books are read from left to right, and identifying the difference between pictures and words. By engaging kindergarten children in a discussion about these features, he is helping them to develop a foundational understanding of how print works, which is crucial for their future reading success.

The other options may address different aspects of literacy development but do not directly relate to what is typically encompassed by print awareness. Vocabulary would involve word knowledge and usage, reading fluency pertains to the ease and speed of reading, while sentence structure deals with the grammatical organization of language, each playing significant roles in literacy but not specifically focusing on the structural features of printed materials.