Thanks for the question! So we’re asked here about what the author thinks the quotation in lines 53-54 best exemplifies. So we should go to that quotation and read it, and also read the lines above and below to understand the full context in which it’s being used. The quotation in lines 53-54 reads, “We lived in that place, eating things. Then we left and went somewhere else.” What’s talked about right before this? Well, the fact that real lives don’t easily arrange themselves as stories with recognizable shapes (lines 51-52)! And after, we’re told that it’s in the process of a dialogue that a shaped story emerges from this seemingly featureless background (lines 55-57).
So clearly there’s a theme here. The stories of people’s lives tend not to have shapes. And that’s what supports (B), that the quotation shows the amorphous (shapeless) nature of the accounts people give of their lives.
Hope this helps! Feel free to ask any other questions that you might have.