Concept:Moderate mental retardation (IQ 35–50) defines individuals who can be taught functional skills. They are known as trainable mentally retarded.Explanation:About 10% of mentally retarded persons fall in the moderate category. Their intellectual development reaches that of a 7–8‑year‑old child. They can learn to talk and communicate during preschool. They are capable of learning self‑care, functional academics, and vocational skills. With supervision, they can work in unskilled or semi‑skilled jobs. They cannot live independently and need care from relatives or in institutions. However, they adapt well to supervised community life. This group is therefore called trainable mentally retarded. In contrast, educable mentally retarded (higher IQ) can learn basic academics, while custodial mentally retarded require constant institutional care.Answer:A. Trainable mentally retarded