Rice. It feeds half the world and is an enormous staple in diets.
The correct answer to this open question is the following.
You forgot to include the options of the question, however, we can answer the following.
A correct analysis of the sentence would be "The prepositional phrase “on the park bench” acts as adjectival phrase."
In this case, the prepositional phrase is going to modify the non that is " the kindly old man." The preposition in the sentence is "on the bench," the place where the old man is seated while feeding the pigeons with breadcrumbs.
Fredrick Douglass wrote his own account of life in which he mentioned about the ills of slavery and about the hardships which the slaves had to undergo. He had tried to expose the cruelty of slavery which doesn't spare anyone born in a black family. He points out the idea that a slave is a form of property owned by the master and he possesses full control over him. Douglass fought for equal rights given to the Blacks to vote. He also wanted equal rights for women including the White women to vote and wanted fair public education granted to everyone.
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