Devin Is a Cheerful Nine-Month-Old Infant Who Wakes Up Every

Devin is a cheerful nine-month-old infant who wakes up every day at 5:30 a.m., eats lunch every day at noon, and goes to bed at 9 p.m. He gets fussy in the afternoon but can usually be lulled to sleep. Like most babies classified by temperament pattern, he would most likely be classified as

A) slow-to-warm-up.
B) fast-to-warm-up.
C) easy.
D) difficult.