C. Full employment is not an element of the US free enterprise system.
A Free enterprise system is a type of economy where there is freedom in the market to engage in the various business activities that you want without much government interference.
There is voluntary exchange in such a system which means that people are free to trade what they have for what they want in order to make profit which is the main motivation for transactions.
There however is no set rule on full employment. Whilst it would be beneficial for an economy to have full employment, it is not a necessity in a free enterprise system.
In conclusion, the answer is that full employment is not an element of the US free enterprise system.
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