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Correct answer: A
Explanation
A is correct because Julius Maada Bio took the oath as President of Sierra Leone on that date. B is incorrect because Ernest Bai Koroma was a previous president and not the one who took the oath in 2018. C is incorrect because Valentine Strasser's political role does not match this specific event. D is incorrect because Ahmad Tejan Kabbah E. Sia Koroma served earlier terms and did not take this oath.