GMAT Sentence Correction (SC) | Re: A newly instituted law mandates that portable gasoline containers be f

I was between B and C and then chose C, because of "similar to those found on" sounded little bit vague. Then in Asnwer choices I learnt that it is due to subjunctive mood , be should be used , not are. But my question here is the usage of pronoun "those" correct here ? (didn't understand explanation in previous post about B)

Thanks in advance

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