magine that you want to surprise your spouse with a vacation for your anniversary because both of you love to travel. You secretly buy plane tickets to Hawaii for the two of you, and while you’re booking a hotel room, you see an advertisement for a two-for-one deal on scuba diving lessons. You hadn’t considered scuba diving before, but now you’re excited about it and decide to purchase the lessons. What types of stimuli were present in this situation?

The desire for a vacation was an internal stimulus, and the promotion on scuba diving was an external stimulus.

Both the desire for the vacation and the desire for scuba diving were internal stimuli.

The desire to surprise your spouse was an internal stimulus, and the plane tickets, hotel room, and scuba diving were external stimuli.

The promotion on scuba diving was an external stimulus, and the purchase of the scuba diving lessons was an internal stimulus.