This question is focused on synonym identification for adverbial inserts. The correct answer is 'A. Particularly' because it serves the same function as 'especially' in highlighting a point or detail. Option B is incorrect because 'specifically' is more precise and refers to particular details. Option C is incorrect because 'frankly' is used to express honesty or directness, not to emphasize a point. Option D is incorrect because 'however' is a contrast adverb, not an emphasis adverb.