A Health Insurance Company Offers a Discount on the Annual

A health insurance company offers a discount on the annual premium to policy holders who complete four specific health screenings each year. This is an example of

A) giving agents "skin in the game" to reduce a risk-aversion problem.
B) rewarding desired behavior to reduce a principal-agent problem.
C) creating incentives to reduce a lemons problem.
D) making hidden actions observable to reduce moral hazard.