Q3 - After purchasing a pot-bellied pig

[Aquamarine]

I chose A for an answer, but I thought B could be an answer too because the stimulus said city codes classify pigs as livestock~~~ -> she would not be allowed to keep the pig~~~~. So it means pigs are not classified as pets just like B.
I have no idea why A is better than B and B can't be answer.

Can anyone explain me why A is an answer and B is wrong?
Thanks!

[rinagoldfield]

Thanks for your post, Aquamarine. Tricky question! I’m glad you highlighted (B). Let’s go through the argument:

1. Amy purchased the pig in Springfied
2. Springfield classifies pigs as livestock
3. Individuals cannot keep livestock in Springfield
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Amy can’t keep the pig

In important inference from the premises is that individuals can’t keep pigs in Springfield. Pigs are livestock, and being livestock is sufficient to “can’t keep it.” If Amy lives in Springfield, then it’s true that she can’t keep the pig.

(A) is necessary because this argument concerns Springfield. We don’t know anything about pigs, livestock, or pets anywhere else. If Amy’s not there, then the argument doesn’t apply to her.
(B) is not necessary. We know that pigs are livestock, and livestock status guarantees that individuals can’t keep the animal. It really doesn’t matter whether pigs are also mammals, pets, really cute, or any other category of thing. Knowing they are livestock is enough.
(C) reverses the logic of the third premise.
(D) is out of scope. Dogs and cats don’t matter here.
(E) relates to the premise, not the conclusion. The argument concerns whether Amy can keep the pig, not her purchase of the pig.

[wxpttbh]

Is B a premise booster?