Answer: C) The speaker is intelligent and clever, but did not excel in high school.
Step-by-step explanation: In the given excerpt from "A Baker's Dozen " by David Matherne, we can see the speaker saying that just because he lasted a year longer than his father to finish school and graduate (his father did it in 12 years and he did it in 13), that doesn't make him a loser (like his father thinks). So from the given options we can make the inference that the speaker is intelligent and clever, but did not excel in high school.