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When an adverb begins a sentence, the best punctuation to use is a comma.
Here's why:
1. A comma is used to separate introductory adverbs from the rest of the sentence. This helps in clarifying the structure and meaning of the sentence.
2. By adding a comma after an adverb at the beginning of a sentence, you create a smooth transition into the main part of the sentence.
So, the correct answer would be:
OA. A comma
I hope this explanation helps! Let me know if you have any more questions.