The correct answer for the question that is being presented above is this one: "B. building of the transcontinental railroad --> disappearance of the frontier." The pair of events that did the first event most directly influence the second is the building of the transcontinental railroad --> disappearance of the frontier.
I believe "most effective" would be the best answer choice out of the choices provided
Answer:
C
Explanation:
If you are pulling off the side of the road, first turn on your signal so people behind you will know. Once you are off the road turn on your hazards. so traffic will see that there is someone in the vehicel and they should slow down a proceed with caution.