A Hospitalized Toddler Was Drinking from a Cup at Home

A hospitalized toddler was drinking from a cup at home, but now refuses to drink from anything except his favorite bottle. This is because the toddler is:

A) Dealing with the anxiety of hospitalization by regressing
B) Demonstrating attention-seeking behaviors because of an overabundance of attention in the hospital
C) Attempting to refocus the attention of the adults around him to avoid further painful procedures
D) Exhibiting normal behavior for his age, as children often stop new behaviors after they feel they have mastered them