Which of the Following Is an Example of a Contingency

Which of the following is an example of a contingency trap?

A) Using a chemical oven cleaner is easier than other methods but exposes the user to potentially carcinogenic agents.
B) Driving may be more convenient than biking, but biking offers health benefits that driving doesn't.
C) Participating in a community clean-up shows others you are a good citizen, but picking up trash when walking alone inspires personal feelings of satisfaction.
D) Making the effort to conserve energy when your neighbors don't can feel like a self-sacrifice.