Jacob riis became famous for exposing the horrible conditions in new york city.

It’s according to the question. but most of the time the answer is b

Cbecause they dump truck

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.