The list you look for is a). The verb 'to go' is an irregular verb because it completely changes its form in the past: went - gone.
The t-shirt that they give only to people who finish is a big reason that so many people take up the challenging race.
This paraphrase presents the same information as in the sentence, but since it should be a bit more of a summary, it takes out the specific detail of how many people actually run the race, which can just be paraphrased into 'so many'.
The answer is
<span>D.<span>Many stores, especially large ones, stay open late at night.
:)</span></span>
