New Technology Used to Study Infant's Brain Function and Developing

New technology used to study infant's brain function and developing language ability suggests that

A) ​infants are smarter and display more emotions than previously believed.
B) ​the ability of many American infants has declined.
C) ​much of what was suspected about language growth has been disproven.
D) ​fine distinctions between speech sounds is rarely recognized by babies during the first months of life.