How do Thomas and Chess refer to a child who tends to be glum,erratic in sleep and eating,and resistant to change

A)  a slow-to-warm-up child 
B)  an easy child 
C)  an uninhibited child 
D)  a difficult child

Thomas And Chess

Researchers known for their work in the area of child temperament, identifying three basic types: easy, difficult, and slow-to-warm-up.

Erratic Sleep

Inconsistent or irregular sleep patterns that can disrupt normal sleep cycles.

Difficult Child

A term often used to describe a child who exhibits challenging behaviors such as high levels of disobedience, aggressiveness, or difficulty in being soothed or comforted.