C. a memory aid
A mnemonic is a memory aid, usually a phrase or visual, that helps you remember a fact.
It shows the doer of the action.It comes before verb and indicates this action or work is done by it/him/her etc.Ex.Susan switched off the lights. Who switched off the lights? The answer is Susan (subject of the sentence)
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.
