Examples of metaphors from the Polar Express:
1.The train wrapped in a apron of steam, 2.Lights appeared in the distance. They looked like the lights of an ocean liner sailing on a frozen sea.
3. crossed a barren desert of ice.
Examples of similes from the Polar Express:
1. candies with nougat centers as white as snow.
2. hot cocoa as thick and rich as melted chocolate bars.
3. rolling over peaks and through valleys like a car on a roller coaster.
A is wrong you wouldn't say "is" you would say are.
B is wrong to because "was" is not the correct verb to use.
D is wrong because key, should be plural, keys
C is correct, because it has subject and verb agreement.
Writing forma English means that you use a wide variety of words.
And those words are some pretty smart words, not the usual ones that are used in everyday speech.