What does Moon Shadow mean when he says this? "The demon stopped and studied Father as you might look at a dog that had suddenly said he was going to the opera."

A: Father said what the demon expected or wanted to hear.

B: The demon was angry with Father.

C: The demon thought Father was a talking dog.

D: The demon was shocked or surprised by what Father had said.

E: None of the above are correct.
Explain your answer to #3. How did you figure out what this meant? List specific words or phrases that helped you determine the meaning.