Answer:
D.The health care industry
Explanation:
A mixed economy is a term that describes a form of economy whereby both the government and private investors or owners are allowed in control factors of production. However, the main purpose of the government ownership in this type of economy is to ensure that the people are not exploited or taken advantaged of by the market or greedy owners.
Hence, given the listed options, the correct answer is option D: The healthcare industry. This is due to its delicate or life and death situations involved, it is better for the government to control it in a mixed economy, so that the people will not be left at the mercy of some greedy private owners.