Final answer:
High-deductible health plans have been demonstrated to reduce health care spending by discouraging moral hazard and reducing the consumption of medical care.
Step-by-step explanation:
One of the options that has been demonstrated to reduce health care spending is high-deductible health plans. When people have high deductibles and copayments for their health insurance, they tend to consume about one-third less in medical care compared to those with complete insurance. This is because deductibles and copayments reduce the level of moral hazard, as people know they have to pay out of pocket for their healthcare expenses. However, it's important to note that consuming less healthcare does not seem to have a difference in health status.