What is the subject and central theme of the short story "the exercise" by bernard mclaverty?

What is implied in this sentence from mark twain's "the £1,000,000 bank-note"? i was puzzled, and wanted to discuss the matter a little further, but they didn't; so i took my leave, feeling hurt and insulted to be made the butt of what was apparently some kind of a practical joke, and yet obliged to put up with it, not being in circumstances to resent affronts from rich and strong folk.

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Geoff bought a picture frame and took a picture with his parents because a) he wanted to be a notable athlete. b) he wanted to remember his trip always. c) he wanted to get into the hall of fame. d) he wanted a baseball player to sign it.