Georgina has a double stroller for her 11-month-old fraternal twins. she has noticed that when someone stops to admire the children, jonah smiles and laughs if the stranger talks to him, whereas irene is more likely to look up at her mother with an uncertain expression. if the stranger talks to irene, she ducks her head and sometimes even covers her eyes with her hands. since georgina has treated both of her children the same way, she knows that jonah and irene have different
a) information processing speeds.
b) habituation criteria.
c) temperaments.
d) information-search strategies.