Which statement is an example of a critical period of development

A)  A child born with cataracts does not learn to see normally if the cataracts are removed after the age of 2. 
B)  A child who is malnourished during infancy develops more slowly than a child who is well nourished. 
C)  A young child learns a second language more quickly than her older siblings or her parents. 
D)  A child born with fetal alcohol syndrome has an intellectual deficit.

Critical Period

A specific timeframe in the development of an organism during which it is especially sensitive to certain stimuli or experiences, which are essential for normal development.

Cataracts

Clouding of the lens in the eye, leading to a decrease in vision and potentially blindness if untreated.

Intellectual Deficit

A condition marked by below-average intellectual function and a lack of skills necessary for daily living, previously known as mental retardation.