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The first sentence identifies a problem: social media spreads misinformation. The second provides a counterpoint: some platforms attempt to fix the problem with fact-checking. The logical relationship is contrast, not example. “For example” implies illustration of the problem, which is misleading. The better transitional phrase is “However,” which signals opposition between problem and response. Thus choice A is correct. Choice B is a tense error but does not address logical clarity. Choice C changes the meaning entirely by suggesting platforms “support” misinformation, contradicting the intent. Choice D (“In contrast”) is close but less precise than “However,” which is the common rhetorical link between a problem and a corrective measure. On PSAT Expression questions, evaluate transitions for the exact logical relationship. Even small shifts in connectors change meaning significantly. Always align the connector with the purpose: addition, contrast, cause/effect, or sequence.