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Option B is correct because it replaces the wordy phrase “due to the fact that” with the concise “because,” improving clarity and economy—two priorities on the FSOT English Expression section. Option A is grammatical but verbose; the FSOT rewards precise, straightforward prose over padded constructions. Option C uses “on account of,” which is idiomatic but less formal and slightly awkward for professional diplomatic writing. Option D contains a comma splice: two independent clauses joined only by a comma. Strong English Expression answers minimize redundancy, avoid colloquialisms when formal tone is required, and maintain correct sentence structure. In official U.S. government communications—briefing memos, front-channel cables, and talking points—concision and precision ensure messages are quickly understood by busy readers and reduce the risk of misinterpretation. Mastery of these editing choices reflects command of grammar, style, and audience expectations that the FSOT evaluates.