Studies of people who immigrated to the United States at different ages or began using sign language at different ages indicate that __________.
A. there is a sensitive period for language in the first decade of life
B. there is a sensitive period for language in the first five years of life
C. language is easier to learn at younger ages but there is not a definitive cut-off age for the learning of a language
D. there is more evidence of a sensitive period early in life for vocabulary than there is for grammar
Answer: C
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