Betsy Wants to Train Her Dog to Perform Several Tricks

Betsy wants to train her dog to perform several tricks. She checks out a book on dog training that includes a chapter on how to use classical conditioning. Betsy learns that a dog is least likely to learn a conditioned response when the

A) unconditioned stimulus is strong.
B) conditioned stimulus precedes the unconditioned stimulus.
C) time interval between the conditioned stimulus and the unconditioned stimulus is under one minute.
D) conditioned stimulus predicts many different stimuli.