How will the right answer fit in terms of support and conclusion?

Only the right answer will accurately describe the support and/or conclusions, and thus accurately describe a flaw.

Highlight the main conclusion in the passage, if there is one:

Smith’s proposed ordinance does not even merit consideration.

Council president: [BACKGROUND]. [BACKGROUND]. [SUPPORT]. Clearly, [CONCLUSION].

Map the wording of the answers to the wording of the passage:

(A) dismisses the proposed ordinance because of its source…

The conclusion definitely “dismisses” Smith’s proposal, and it’s based on support about what “he owned”, not about the proposal itself. This is a big winner.

(B) takes a single fact that is incompatible with a claim…

The fact that “he owned an appliance store” isn’t “incompatible” with the conclusion. That would mean they factually contradict one another.

(C) …between deceptive sales tactics and legitimate methods of increasing sales

There’s only one “tactic” mentioned or referenced in the passage, so no “distinction” between these groups is relevant to the argument.

(D) …simply restates a claim presented in support…

Nothing in the passage got repeated.

(E) generalizes…to all instances of that kind

Nope, the conclusion is only about one “instance”.

(A) is the correct answer.