2. Down's syndrome is the most common genetic form of
intellectual disability, and ___ approximately one in 1,000 people.
(A) afflicts (B) effects
(C) infects (D) inflects
(A) afflicts-to make people suffer mentally/physically (C) infects-to pass a disease to a person/animal/plant (D) inflects-if a word inflects, its form changes according to its use