Research consistently confirms, as Piaget predicted, that young children's thinking is egocentric.

Researchers announce that their study of identical twins has revealed a high heritability for divorce (McGue & Lykken, 1992). Given that our prehistoric ancestors hadn't yet invented marriage, let alone divorce, what on earth could this finding mean

What will be an ideal response?

Each of these is a self-report research methodology EXCEPT

a. experimentation. b. the clinical method. c. interviewing. d. questionnaires.