Answer:
c. difficult
Explanation:
According to Thomas and Chess, there are three types of temperament in child i.e. slow-to-warm-up, easy and, difficult.
The slow to warm up child is quite negative, exhibits a low potency of mood, and shows low adjust-ability.
The easy child adjust easily to new experiences, normally have a positive mood, easily begin regular routines in infancy.
The difficult child cry very often and react negatively, as well as slow in adjusting to new experiences
