The answer is B: In the 105-degree weather, the city became a vast microwave oven.
A metaphor is a figure of speech that establishes a comparison or analogy between two things by referring to one thing but mentioning another. A metaphor tends to bring out the identity or similarity between two ideas that would be, in literal terms, disassociated otherwise.
A metaphor is different than a simile in as much as a metaphor directly establishes the similarity or comparison between two things (“the city became a vast microwave oven), whereas the simile does this in an indirect way, by introducing the word “like” or “as” (for example: the city was like a vast microwave).
