Which is an example of an SDp?

A. Hannah's mom asks her to get rice started for dinner. Hannah plays video games instead but jumps up to get started when she hears her mom's car pull into the driveway.
B. Hannah needs to charge her electric vehicle. She passes a sign on the highway that says "car charging stations - next exit".
C. Hannah's teacher wears a green necklace when students can ask her questions. Hannah raises her hand when she sees her teacher put on the green necklace.
D. Hannah trains her dog to find treats in a cup by sniffing the cup with a closed lid. When her dog paws the cup with the treat, she gives it to him. He sniffs a cup without a treat and walks away.