Read the excerpt from The Odyssey. Neither reply nor pity came from him,
but in one stride he clutched at my companions
and caught two in his hands like squirming puppies
to beat their brains out, spattering the floor.

The epic simile in this excerpt shows

how helpless Odysseus’s men are in the clutches of the Cyclops.
how violently and uncivilized the Cyclops behaves himself.
that Cyclops is enormous in comparison to Odysseus and his men.
that there is no possible escape for Odysseus and his men.

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).

c. a group of tribes that formed a confederacy

elon musk, ceo of spacex, a startup space company is planning to head to mars by 2023. nasa is planning to go to mars at around 2025. both are just for a basic colony.