Which of the following concepts is best illustrated by the activity?

Mastering sight words involves recognizing commonly used words by sight without needing to sound them out, which is essential for reading fluency. However, this concept does not directly relate to the activity of grouping words based on their morphological connections, as sight words do not typically exhibit shared roots or patterns.

Working with syllabication refers to breaking words into their syllables to aid in pronunciation and understanding. While syllabication is an important reading skill, it does not focus on the relationships between words that are created through shared roots, which is the focus of the activity in question.

Identifying prefixes and suffixes involves recognizing the additions to the base of words that modify their meanings. While this skill is related to understanding word structure, it does not encompass the broader concept of creating word families that includes recognizing the base words themselves and their derivations, which is the essence of the activity.