Answer:
B. people respond to economic incentives.
Step-by-step explanation:
Economic incentive is material given by someone, that is capable of motivating the other person to behave or act in a certain way. If economic incentives come from a government, it can be in form of tax incentives, subsidies or any monetary gift in form of cash or near cash.
To the economist, human being being rational, will respond to economic incentives in various forms.