The author does not assume that not having a free market always leads to having a highly controlled economy. He just uses an example of a highly controlled economy in his conclusion, but makes no indication of the relationship between the two types of economies.

The distribution of utility in any type of economy is irrelevant to the author’s argument. He only brings up how to maximize utility, not how to distribute it.

This answer choice implies that the author ignores other avenues of achieving maximum utility, which he does not. The author explicitly recognizes that there are other types of economies that can achieve maximum utility in his premise.

The author concludes that a free market, which guarantees maximum utility, is the most likely way to achieve maximum utility. However, the author also mentioned that other economic systems can achieve maximum utility, without indicating which system has the highest chance of achieving that.

The drawbacks of any economic system are irrelevant to this argument. The author is only concerned with achieving maximum utility and which economic systems can and are most likely to do so, not what will happen when maximum utility is achieved.