C) sound wave travels across the hall
Expectation because people where getting excited for it but then it didn't happen
Electricity today is a very important source of life. Almost all life activities depend on electricity. Power cuts or power outages cause some activities to stop. Power outages are caused by other electrical activities, of course, which have the same path. For example, the installation of several towers or power poles, time-consuming cable repairs. In addition, there are causes outside of electrical activity, namely the occurrence of fire disasters. To avoid things that are not desirable, of course, must be quick to respond to this by turning off electricity en masse. What can happen, of course, is that neither party benefits.
I believe the correct answer would be C-discuss one subject fully, then move on to the next subject