The argument says that parents should not be given choices on what is taught to their kids in nursery school. The argument then tries to support this assertion by claiming that if such parents are given choices, they are never happy. An example of this kind of behavior follows. Lets examine each one of the choices to see which one fits the bill in identifying the flaw in the argument.

(A): The argument does not mention any ideas advocated by opponents, so misrepresenting such ideas is out of the question. Incorrect.
(B): The conclusion is that parents should not be given choices on what their kids study in nursery school, and the supporting premise is that the parents who are given this information are never happy. It is the premise that leads to the conclusion, and not the other way round. Incorrect.
(C): Rather than discussing the idea, the argument does attack the people who support it. CORRECT.
(D): The definition of 'happy' is clear here, and does not constitute a flaw in the argument. Incorrect.
(E): The stimulus in fact summarizes a position that supports the argument, not one that the argument discredits. Incorrect.

(C) it is.
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Could not understand what does 'does not discuss the idea' mean?
The argument clearly mentioned what the idea is. The idea that parents should not be given choices in the material taught to their children in nursery school.
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The answer choice says: does not discuss the idea being argued.
This is correct because although the argument mentioned what idea is, it failed to discuss it. Fine line between mentioning and discussing.
For the argument to be strong enough, it should have discussed the other side too- it should attack non-supporters too or it should support or give reasoning for supporters.

Just my 2 cents!

Here the premise logically (although logic could be flawed but it is still logical) leads to conclusion:

Leads to


To provide support to premise, we also have example:


We can see here that author didn't just assume conclusion to be true. In fact, author has arrived at the conclusion with some logical reasoning in his mind stating the premise and providing evidence as a support for the premise.
That s why B is wrong.

Hope it helped.

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