In the Case of IQ Scores, a Large Number of Separate

In the case of IQ scores, a large number of separate studies of several thousand twins have produced estimates of the average correlation between monozygotic twins of approximately r = __________ and same- sex dizygotic twins in the region of r = ___________.

A) 1; 0.83
B) 0.86; 0.44
C) 0.93; 0.83
D) 0.86; 0.60