Editorial: Given the law of supply and demand, maximum total utility

Editorial: Given the law of supply and demand, maximum total utility is assured only in a pure free market economy, although other types of economies might be able to achieve it. Obviously, then, a country that has a highly controlled economy, and is not trying to bring about a pure free market economy, is not acting in the way that is most likely to bring about maximum total utility.

Boil it down- a country that has a highly controlled economy, and is not trying to bring about a pure free market economy, is not acting in the way that is most likely to bring about maximum total utility.

The editorial’s argument is most vulnerable to criticism on the grounds that it

(A) presumes, without providing justification, that any country that does not have a pure free market economy has a highly controlled economy - Incorrect
(B) presumes, without providing justification, that the way in which utility is distributed is less important than the total amount of utility - incorrect - No comparison about the relative importance of total utility and the way in which it is distributed is made.
(C) fails to consider that the way most likely to achieve a particular end may not be the only way to achieve that end- incorrect - The argument suggested that other economic systems may also be able to achieve maximum total utility.
(D) presumes, without providing justification, that trying to bring about a condition that will ensure the achievement of an end must always be the way most likely to achieve that end- Correct
(E) ignores the possibility that a pure free market economy will have serious drawbacks that outweigh the benefits of maximum total utility- incorrect-- no discussion about drawbacks

Is option D right because argument concludes something about likelihood "..not acting in the way that is most likely to bring about maximum total utility" ? and we can't logically conclude anything about something's being likely from the argument above. KarishmaB