a) Go about, b) Go after, and d) Go through are phrasal verbs, where the meaning changes significantly when combined with the preposition (e.g., "Go about" means to deal with something, "Go after" means to pursue, "Go through" means to endure or experience).
c) Go fast is a literal expression, meaning to move quickly, without forming a distinct phrasal verb.
Thus, c) Go fast is the odd one out
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