Studies of Morpheme Acquisition Have Shown All of the Following

Studies of morpheme acquisition have shown all of the following except

A) children acquire morphemes, such as -s, 's, and -ed, in essentially the same order, although the rate of acquisition may vary
B) morphemes that are acquired first are phonologically easier than morphemes that are acquired later
C) the frequency with which morphemes are used in adult speech does not predict the ease with which children acquire those morphemes
D) the order in which morphemes are acquired is a function of how semantically and grammatically complex they are