Experiments Conducted by Anne Fernald on 8-Month- Olds' Comprehension of the Meaning

Experiments conducted by Anne Fernald on 8-month- olds' comprehension of the meaning of the emotional tone of their mothers' speech indicated that:

A) infants this age cannot differentiate between positively toned and negatively toned speech.
B) although infants this age can differentiate between positively toned and negatively toned speech, they do not behave as if they comprehend the meaning of the emotional tone.
C) infants this age behave as if they comprehend the meaning of the emotional tone of their mothers' speech.
D) infants this age can adapt their behavior to the emotional tone of their mothers' speech only if the content of the speech is consistent with the emotional tone.