Imagine that Dr. Walsh measures the heritability of anger in pairs of siblings who are being reared together

She finds a correlation of .15 between pairs of adopted siblings who are
biologically unrelated, a correlation of .63 for fraternal twins, and a correlation of .92 for
identical twins. These results suggest that
A) both the environment and genetics contribute substantially to the variability in anger.
B) relative to the influence of genetics, the environment contributes relatively little to
variability in anger.
C) compared to the impact of the environment, genetics contributes relatively little to
variability in anger.
D) the shared environment contributes greatly to the variability in anger only among
identical twins.

B