Which measure can be considered suitable for educating ‘mentally retarded’…

Concept: Educational provisions for exceptional children differ by the child's specific need. Gifted or talented learners, who master content faster than the standard pace, are catered to through acceleration (faster progression through the curriculum), enrichment (deeper or broader content at the same level), or a higher-level curriculum. Children with an intellectual disability, whose learning pace and cognitive processing differ from the average learner, instead need instruction individualized to their own level and speed, not simply more or faster content.

Application: This question concerns children labelled 'mentally retarded' (intellectually disabled), not gifted learners. Among the four measures offered, the one that fits this need is individual instruction: it tailors the teaching content, method, and pace to each specific child, rather than assuming the child can absorb faster or more advanced material.

Cross-check: Acceleration, enrichment, and a higher-level curriculum are all standard measures reserved for gifted or talented learners — exactly the opposite need:

• Acceleration measure moves a fast learner through the standard curriculum more quickly; unsuitable for a learner who needs a slower, individualized pace.

• Enrichment measure adds extra depth or breadth on top of already-mastered content; it assumes the base curriculum is too easy, not too hard.

• Higher-level curriculum raises the difficulty for advanced learners; it assumes greater, not lesser, capacity to absorb content.

None of these three fits a child who needs simplified, individually-paced instruction, which confirms individual instruction as the measure suited to educating children with an intellectual disability.