Critical Reasoning (CR) | A cost-effective solution to the problem of urban-suburban traffic

Hi all,

How does option C weakens the argument.

It talks about "Many new highways are being built" and not about establishing flexible mass transit , infact it says mass transit already exists.

Only way i can think how C can weaken is,
Despite the mass transit, highway is still constructed => implies that over-crowding in mass transit forced government to construct highway, in that way, flexible mass transit will not solve the problem, but for this reasoning, we have to
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