Your a freshmen n dont know how to write a poem
The correct answer is 1. an extended comparison.
A metaphor is a type of comparison - when you are symbolically comparing two or more things (without using words such as like or as), you are using a metaphor. If you extend that metaphor into several lines or stanzas within a poem, then you are using an extended metaphor, which commonly appears in epic poems such as The Odyssey or The Iliad.
Even though Esquivel knows the story of maiz is a myth, she nevertheless warns her daughter not to step on a kernel of corn because the corn represents fertility and the kernels are part of the ritual. It would be wrong, or perhaps even sinful to step on such an important symbol of their culture which is why Esquivel doesn't want her daughter to be in some kind of danger because of such a reckless act.