Final answer:
The activity promotes reading development by emphasizing the importance of basing interpretations on textual evidence.
Step-by-step explanation:
The activity is most likely to promote students' reading development by helping them understand the importance of basing interpretations about a literary work on textual evidence. By asking students to bring in an object and identify passages from the book to support their choices, the activity encourages students to locate and analyze specific information from the text. This emphasizes the need for evidence when making interpretations about a literary work.