Which revision best corrects the underlined sentence?
scientists have studied the benefits of hobbies.
having a pastime reduces stress
scientists have studied the benefits of hobbies,
having a pastime reduces stress.
scientists have studied the benefits of hobbies, but
having a pastime reduces stress
scientists have studied the benefits of hobbies:
however, having a pastime reduces stress.

"Scientists have studied the benefits of hobbies. Having a pastime reduces stress."

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answer is personification

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).