Question

What is the adjective clause in the sentence? The books that I borrowed from the library were not yet overdue.
A. That I borrowed from the library
B. From the library
C. Where not yet overdue
D. The book

Answer 1

Your answer would be A, that I borrowed from the library
When trying to figure out what an adjective clause is ask the two questions
which and what? So what book? Which book?
Hope this helps :)