What does an analogy do?
a, it illustrates a test question.
b, it illustrates a relationship.
c, it illustrates a point.
d, it illustrates a picture.

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).

the answer is:

magna carta

c. to understand which information will best persuade your readers. (apex) correct answer.

is this multiple choice?