0. With respect to the development of skills, all of the following are correct except that :
Even if students have the same mental age, they may differ in learning styles, motivation, and background knowledge. So, they do not necessarily learn at the same rate.
Option A: pupils of the same mental age should learn at the same rate – Incorrect; individual differences still exist.
Option B: group instruction facilitates the learning process – Correct in many classroom environments.
Option C: learning individual instruction is often required – True, especially for students needing personalized attention.
Option D: workbooks can be an invaluable learning aid – True; they reinforce learning through practice.