"I know you're a good ballplayer," he barked. "What I don't know is whether you have the guts."

I knew it was all too good to be true. Here was a guy questioning my courage. That virtually amounted to him asking me if I was a coward. Mr. Rickey or no Mr. Rickey, that was an insinuation hard to take. I felt the heat coming up into my cheeks.

—I Never Had It Made,
Jackie Robinson, as told to Alfred Duckett

Based on the passage, what is Jackie Robinson's purpose in telling this story?

to persuade readers that he is not a coward
to inform readers of how he felt while talking to Mr. Rickey
to entertain readers with a funny story