Answer:
A. if mothers were more negative toward one of their twins, that twin became more antisocial at age 7 than at age 5.
Explanation:
In this experiment, women described each of their twins, and sometimes, the descriptions were quite negative. In the cases where the mother reacted more negatively towards one of the twins, that twin became more antisocial by the age of 7. This might suggest that the attitude that the mother had toward the twin influenced him significantly, making him less social than he otherwise could have been.