When Learning Disabilities Are Identified by a Child's Performing Below

When learning disabilities are identified by a child's performing below expected grade or age,

A) the child must be at least two grades or years behind what is expected.
B) the child must be at least three grades or years behind what is expected.
C) a large discrepancy with peers appears more serious for younger than older children.
D) a large discrepancy with peers appears more serious for older than younger children.