What happened to America in 1937 during the Great Depression years that set the U. S. further back in its quest for economic stability? World War II began.
Roosevelt passed away.
Another recession began.
Many labor strikes took place.

a

explanation:

because i the point in view is between characters

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).

a.) literature that explores grotesque characters and eerie, violent occurrences in a dreary setting.