Which excerpt from “i know why the caged bird sings” best justifies the inference that bailey is a supportive brother to marguerite?

another negro woman of her health and age would have been expected to carry the paper sacks home in one hand, but momma said, "sister flowers, i'll send bailey up to your house with these things."
i wanted to gobble up the room entire and take it to bailey, who would me analyze and enjoy it.
i was respected not as mrs. henderson’s grandchild or bailey’s sister but for just being marguerite johnson.
momma and bailey were waiting inside the store. he said, “my, what did she give you? ” he had seen the books, but i held the paper sack with his cookies in my arms shielded by the poems.

He leaned his head against the wall; his eyes were shut, his hands clasped in each other, and his body seemed to be sustained in an upright position merely by the cellar-door against which he rested his left shoulder. the lethargy into which he was sunk seemed scarcely interrupted by my feeling his hand and his forehead. his throbbing temples and burning skin indicated a fever . . there was only one circumstance that hindered me from forming an immediate determination in what manner this person should be treated. my family consisted of my wife and a young child. our servant-maid had been seized, three days before, by the reigning malady, and, at her own request, had been conveyed to the hospital. we ourselves enjoyed good health, and were hopeful of escaping with our lives. our measures for this end had been cautiously taken and carefully adhered to. they did not consist in avoiding the receptacles of infection, for my office required me to go daily into the midst of them; nor in filling the house with the exhalations of gunpowder, vinegar, or tar. they consisted in cleanliness, reasonable exercise, and wholesome diet. who is the story’s first-person narrator