Answer:
C. And trains pass with windows shining / Like a smile full of teeth.
Step-by-step explanation:
Similes are the literary techniques where one thing is compared to another that may be of a different kind. This comparison may happen between two very different things, but used so that the intended meaning of the word may be made more clearer.
In the given poem "The City Is So Big" by Richard Garcia, the poet used this simile when talking about the trains. In the poem, he states how the "trains pass with windows shining/ like a smile full of teeth". This simile shows how the trains compare to the teeth of a man, shining and bright. Thus, the correct answer is option C.