ok explain why a and b dont make sense
for me, a makes sense because a bypass will make cars less idle and thus less noise pollution on streets. b makes sense because a bypass will mean less cars are caught up at traffic lights on local roads, hence less traffic. i dont see how a highway can create more traffic.
I think it's B, because if there are tollways, then traffic will decrease significantly locally and therefore, B is not an externality. A is incorrect though, as tollways will increase noise pollution, I just read it on many websites such as this:
having a home near
expressways may impact the quality of life of the residents because of increased exposure to noise and air pollution.
As for C, it is very debatable as some studies prove that it depreciates house prices while others prove that they cause property appreciation.
And D is completely wrong, as it is an intended consequence, and externalities are unintended side effects.
So I reckon there will be two answers for this MC, that is, B or C, but I'm leaning more towards B.