Research on the attitudes of twins suggests

a. that genetics are not useful in predicting the attitudes different people will hold.
b. the attitudes of identical twins are more similar than the attitudes of fraternal twins.
c. the attitudes of twins who are reared apart from one another are more dissimilar than the attitudes of twinsraised together in the same household

d. that the first-born twin is likely to be more conservative than the second-born twin, even when their births areonly separated by minutes.

b