In the Rosenthal and Jacobson (1968) Study Involving the IQ

In the Rosenthal and Jacobson (1968) study involving the IQ scores of grade-school children,

A) children who were genetically predisposed to achieve an intellectual spurt actually did increase their IQ scores at the end of the school year.
B) children who came from an intellectually stimulating home environment had increased IQ scores at the end of the school year compared to their peers.
C) teachers were told that certain randomly selected children were "intellectual bloomers" and those children did in fact experience an IQ increase at the end of the school year.
D) All of the above.