After comparing children with normal reading ability to those with specific reading disability, what have researchers concluded?

a) The problems of the reading disabled are related to attention and not to perception of visual stimuli.
b) Most children with a learning disability tend to be left-handed and rely more on one eye than two eyes.
c) Children with a reading disability seem to have impaired ability when the contrast between letters and background is reduced.
d) Most children with their learning disability have a slight motor tic that interferes with their ability to maintain their place when reading.

ANS: c