Researchers Alexander Thomas and Stella Chess

Researchers Alexander Thomas and Stella Chess:

A) studied the effect of day care on attachment and development.
B) studied the detrimental psychological effects of allowing an infant to sleep in the same room or bed with the parents.
C) found that most infants can be classified as having one of three basic temperament patterns.
D) examined the emotional experience of dying and proposed the idea that there are five stages that people progress through as they face death.