According to the Discussion of Infants' Memory

According to the discussion of infants' memory,

A) there is no evidence of long-term memory until infants are about 6 months of age.
B) the major problem in studying infants' memory is that babies cannot accurately see visual stimuli until they are 3-4 months old.
C) it is so difficult to measure infants' memory that we do not know much about the memory skills of young infants.
D) in the infants' brain, some parts concerned with memory are not fully developed.