What details from a story best help develop the theme?
O readers' prior knowledge
the author's motivations for writing
descriptions of time and place
character motivation and plot

character motivation and plot

Explanation:

stories are mostly built on the character achieving their goals and the struggle with the plot interfering with their goal.

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).

brazil   is on the caost