SAT Question 2ec0e43e: Text Structure And Purpose answer and explanation

English - Text Structure And Purpose - Function Of Underlined Portion
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Alternative-history fiction is a subgenre of science fiction in which plots center on “what if?” questions. What if India had started the Industrial Revolution? What if Soviet cosmonauts had been first to land on the moon? Speculative counterfactuals like these can be great fodder for stories, but they’re also commonly deployed by academic historians to better understand factors influencing historical events. Well-realized and coherent alternative-history stories can thus complement historians’ speculations about the past.
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Difficulty:Medium
Which choice best describes the function of the underlined portion in the text as a whole?