Prefix underlined within the following word: enclosure. a. over b. within c. beside d. upon

I am pretty sure it's over but you might wanna wait for someone else to answer as well im not always right I hope you et your answer!

The answer is within

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).

the answer can be "credo" it means to believe = the word credo means "an official statement of beliefs"