Question

the most reliable source for a presentation about education in multi - age classes would be a
school textbook for students.
parenting blog about student mentors.
wiki website about the history of one - room schoolhouses.
journal article about classrooms with students of varying ages.

Explanation:

Journal articles are peer - reviewed and provide in - depth, research - based information. A school textbook may not focus specifically on multi - age classes. Parenting blogs lack peer - review and may be opinion - based. Wiki websites can be edited by anyone and may not be reliable for specialized topics like multi - age education.

Answer:

D. journal article about classrooms with students of varying ages