Which line from “Raymond's Run” is evidence that Squeaky has courage? I take my time getting to the park on May Day because the track meet is the last thing on the program. So I always come late to the May Day program, just in time to get my number pinned on and lay in the grass till they announce the fifty-yard dash. But now, if anybody has anything to say to Raymond, anything to say about his big head, they have to come by me. I’m standing on the corner admiring the weather and about to take a stroll down Broadway so I can practice my breathing exercises . . .

It appears that this question is a multiple choice question. Based on the four quotes given, I believe that the third option is the best of the quotes that show Squeaky acting in a courageous manner. Quotes 1, 2, and 4 show Squeaky as more confident in herself and her abilities than they do show courage. Quote 3 shows courage because she is putting herself out there as protective shield for Raymond's sake.
One thing to notice about the quote is that Squeaky says that if anybody has anything negative to say about Raymond, they are going to have to deal with her. "Anybody" shows a lot of courage because it means that she is willing to take on a person that might be bigger, stronger, faster, smarter, etc. than her. It doesn't matter to Squeaky. She is willing to stand up for her brother in any situation and in any way that might be needed . . . even if she'll lose. That's a courageous attitude.