What is evidence? OA) a question you have while reading the text
OB) a quotation from the author about writing the text
OC) something you want to know about the topic but cannot find
OD) facts and supporting information used to prove something is true

D) facts and supporting information used to prove something is true

Explanation:

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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).