I would say A but I’m not sure
In my opinion:
-Use clear and concise words
-Don't make the sentences too long
-If you want to list info put it in bullet points
-Don't use bombastic words
Answer: Nevertheless
Explanation: Well otherwise would be the opposite of specifically, so it's not that one. Similarly isn't similar to specific at all so using that instead also wouldn't work. Incidentally just isn't the correct word you would use in a sentence like that so I would say the answer is nevertheless.