Answer:
C. Individual Mandate
Explanation:
The Affordable Care Act (ACA) or Obamacare came into law in 2010 which was aimed to provide affordable health insurance for all Americans. But this act increased the National health spending due to the expansion of health care coverage.
The Obamacare was mandatory for individual American and those were penalized who refused to buy it. Thus, the law did not controlled the cost of health insurance.
Hence, the correct answer is "C. Individual Mandate".