In what sense does first language acquisition involve a "logical problem"? select one:
a) it is difficult to understand children when they begin to acquire language. the problem is how they end up being comprehensible adult native speakers.
b) the speed and depth of first language acquisition make it incompatible with the rate of development in other cognitive domains like vision and hearing.
c) children are strongly resistant to grammatical correction from adults. thus, it is not clear how they end up acquiring the language.
d) children are born ready to acquire any human language. however, they typically only acquire the one(s) in their environment.
e) the kinds of input that a child receives does not seem commensurate with the grammatical knowledge that native speakers possess. f) despite differences in culture and child-rearing practices, children all over the world still pass through identical stages of language development.