Final answer:
Lacy refuses to drink because she generalizes from the Scooby-Doo cup to the Dora the Explorer cup.
Step-by-step explanation:
Lacy refuses to drink because she generalizes from the Scooby-Doo cup to the Dora the Explorer cup. Generalization is a cognitive process where a stimulus that is similar to the original stimulus elicits a similar response. In this case, Lacy has associated her favorite juice with the Scooby-Doo cup, so when presented with a cup that is similar in appearance (Dora the Explorer cup), she refuses to drink.