The findings of research on the early perception of language-relevant speech sounds are significant in that they demonstrate that
a. adults have sensitivities to sounds that infants do not have.
b. adults lose their sensitivities to language-relevant speech sounds as part of the natural aging process.
c. there are no differences between infants and adults with respect to their sensitivities to language-relevant speech sounds.
d. infants start out with sensitivities to sounds that they lose if these contrasts are not used in their language.
Answer: d. infants start out with sensitivities to sounds that they lose if these contrasts are not used in their language.
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