Mary Rothbart and Hwang (2005),studied Infants at Different Ages and Found

Mary Rothbart and Hwang (2005) ,studied infants at different ages and found that:

A) stability of temperament tends to increase as infants mature.
B) stability of temperament tends to be higher over long intervals of time.
C) stable individual differences appear to emerge in mid-life.
D) most temperament variables are highly unstable over time during the first year of life.