In landmark psychological studies of the 1920's, Jean Piaget observes the behavioral repertoires of his ownchildren to further his understanding of the development of knowledge.
(A) observes the behavioral repertoires of his own children
(B) observed the behavioral repertoires of his own children
(C) observed the behavioral repertoires performed by his own children
(D) observed behaviors by his own children
(E) observes the performance of his own children's behavior
...
(A) observes the behavioral repertoires of his own children
(B) observed the behavioral repertoires of his own children
(C) observed the behavioral repertoires performed by his own children
(D) observed behaviors by his own children
(E) observes the performance of his own children's behavior
...
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