Clara chose this excerpt to help support her interpretation of “The Caged Bird” because it has an extended metaphor that examines

suffering

Explanation:

Here's the complete question:

I sit and look out upon all the sorrows of the world, and upon all oppression and shame; I hear the secret convulsive sobs . . .

Clara chose this excerpt to help support her interpretation of "The Caged Bird" because it has an extended metaphor that examines

An extended metaphor refers to the version of metaphor which extends over several stanzas, lines, or paragraphs.

With regards to the question, the extended metaphor examines suffering. This can be deduced from the poem where it was written that "I sit and look out upon all the sorrows of the world... "

there mad at that place

as for symbolic actions, the narrator's tearing down the wallpaper in an attempt to find the "woman" in the wallpaper represents her struggle to retain or regain her sanity.   the wallpaper has been part of her confinement and by her tearing it down, she is freeing herself from that confinement.