What does Duane Jr ask Nick to borrow?

Duane Jr asks Nick to borrow his biology book because he likely needs it for studying or completing assignments related to their biology class. The context suggests that Duane Jr recognizes a specific need for resources that align with their current subjects. In this case, the biology book is essential for understanding key concepts or preparing for tests. The other choices, while potentially useful for study, do not match the specific request made by Duane Jr.