Effective teachers find ideas and inspiration for their lessons from

A. teacher guides that accompany textbooks

B. other teachers

C. teaching magazines and websites

D. All of the above.

D. All of the above.

Explanation:

Effective teachers can find ideas and inspirations from just about anything in their life, but especially from other teachers, teaching magazines and websites, and teacher guides that accompany textbooks because they often include tips to make the lesson fun and interesting for students.