In what way does the choice of a narrator, persona, or speaker affect the tone of a text?
a.) the choice determines the tone's point of view.
b.) the choice determines how the tone develops in the climax.
c.) the choice never impacts the tone(s) in a text.
d.) the choice determines how the audience perceives a given tone.

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explanation:

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).