One Problem with Cross-Cultural Research Studies Is That They

One problem with cross-cultural research studies is that they

A) must always conclude that similar behavior found in children of different cultures must be biologically determined.
B) can never conclude that similar behavior found in children of different cultures may be biologically determined.
C) can never be of much benefit to developmental psychologists.
D) must make certain that the tasks given to children from different cultures are equated with respect to language and the type of task used.