Rebecca Is an Infant That Her Mother Describes as a Very

Rebecca is an infant that her mother describes as a very quiet baby that can get pretty fussy when she doesn't like something. She doesn't feel comfortable with new people right away. She doesn't move around much and is wary of new situations. Which style of temperament would Rebecca most likely fall under?

A) slow-to-warm-up
B) easy
C) difficult
D) a combination of easy, difficult, and slow-to-warm-up