Billy, at 12 Months, Rules His Household

Billy, at 12 months, rules his household. Although he does not maintain a predictable schedule himself, he insists everything else in the world remain constant including his bedding, eating utensils, and even the shoes he wears. He reacts violently to new babysitters, and with extreme agitation when doing something he enjoys, such as rough-and-tumble play with his uncle. Based on the NYLS classification scheme, Billy is BEST described as

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