How do metaphors and extended metaphors differ?
while a metaphor is limited in length, an extended metaphor is developed over the course of a poem.
while a metaphor describes the way someone thinks or feels, an extended metaphor compares multiple unlike things.
while a metaphor conveys a set of ideas, an extended metaphor conveys a single idea across the poem.
while a metaphor makes a comparison, an extended metaphor shows the attitude of a text toward its subject.

While a metaphor is limited in length, an extended metaphor is developed over the course of a poem.

Explanation:

This is the correct explanation of how metaphors and extended metaphors differ. A metaphor is a figure of speech that directly refers to one thing by mentioning another. Metaphors serve several purposes, but they are usually used in order to provide clarity. An extended metaphor fulfills the same role. However, this is "extended" because it is developed over the course of a whole poem.

attitude toward the subject implied in a literary work.

serious at times, angry, impassioned, and optimistic, but most of all urgent