Research on infants' numerical knowledge suggests that 5-month-olds can ________.
A. discriminate quantities up to ten and use that knowledge to add but not to subtract
B. discriminate one from two and use that knowledge to add and subtract.
C. distinguish among large sets of items-for example, both 8 versus 16 and 8 versus 12
D. add and subtract large sets of items, including 8 + 16 and 12 - 8
Answer: B
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