While on the subway on his way to see faber, montag remembers his cousin promising to pay him a dime if he can fill a sieve with sand. this memory is a metaphor for montag trying to…

pay a visit to someone who doesn’t know he’s coming.

keep the importance of books in the minds of the people of his society.

build a meditation garden made of sand in his backyard.

remember the good times of his childhood.

D) remember the good times of his childhood.

Explanation: a metaphor is a figure of speech that consists in making a direct comparison (without using the words "like" or "as") between elements that aren't obviously related, in order to create an image in the reader's mind. In the given excerpt we can see an example of a metaphor where Montag is remembering his cousin promising to pay him a dime if he can fill a sieve with sand, because he associates this memory with the good times of his childhood.

from the excerpt from the "the dark game" the reader can infer that folke cronholm was spying for the allied nations.