Which of the Following Best Describes the Unusual Events That

Multiple Choice

Which of the following best describes the unusual events that occurred in Pavlov's laboratory that led him to the discovery of classical conditioning?

A) Dogs salivated after meat powder was placed in their mouths.
B) Dogs sometimes salivated before the meat powder was placed in their mouths.
C) Salivation existed in dogs as an unlearned reflex.
D) Dogs salivated if and only if they were given a reward.