Heaven knows how to put a proper price upon its goods.

what literary device is used in the sentence above?

personification
assonance
repetition
simile

A) personification.

Explanation: personification is a figure of speech that consists in giving human characteristics to non human objects (or animals), in order to exemplify something or to create an image. In the given sentence we can see a clear example of personification, because it says that heaven (non human object) knows how to put a proper price upon its goods (human characteristic).

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).