<span>prove his point by spelling out the options available with an education.
In his parallelism, he is showing that you'll realize your potential or interests in school while doing a project or writing an essay. The last part of the parallelism speaks about classes, so we know that his emphasis is on education. This eliminates the first and last options. He isn't necessarily choosing the best classes here, just using English and science as an example. This leaves the third option as the correct choice.
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