An expert team of scientists compared 1,000 sets of monozygotic twins reared by their biological parents (caspi et al., 2004). the researchers asked the mothers to describe each twin. descriptions ranged from very positive to very negative. the researchers measured personality at age 5 (including antisocial behavior as reported by kindergarten teachers) and then measured each twin's personality two years later. the results revealed that
a. if mothers were more negative toward one of their twins, that twin became more antisocial at age 7 than at age 5
b. if mothers were less negative toward one of their twins, that twin became more antisocial at age 7 than at age 5
c. if mothers were more negative toward one of their twins, that twin became less antisocial at age 7 than at age 5
d. that there was no relation between maternal negativity and child antisocial behavior.

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.

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chronological thinking is an indispensable tool to structure a historical narrative and to give meaning to a sequence of events. the final section presents the results of a survey to test the chronological thinking of lower secondary school students carried out by the educational research institute.