What does it mean prolong

it means to extend. for example "he hoped he could prolong his cars life"

Explanation:

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the answer is:

d. a story that frightened readers so much they would become suspicious of their surroundings

frankenstein is one of the terror novels wrote by the writers in a sort of bet, lord byron challenged them all to write a ghost story, and the story came to mary shelley in a dream, she wanted to conect with the fears of her society, fears of technology and changes, and she wanted readers to look around, freightened.

explanation:

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b. our party quickly made its way into the cave / but we failed to find our host [the cyclops] himself inside.