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The main reason an author includes evidence in a case study is to help the reader
Abel
create a case study.
add to the case study.
draw a conclusion from the case study.
O conduct an investigation from the case study.

b would be your answer due to the specifics of   it.

explanation:

well idk if im right cause u know but any ways i belive that its civil

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).

buenas noches would be your answer