I think it is D. If it’s wrong i am sorry but i think it’s right
Transition words I believe
Answer:
In chemistry, there are three definitions in common use of the word base, known as Arrhenius bases, Brønsted bases and Lewis bases. All definitions agree that bases are substances which react with acids as originally proposed by G.-F. Rouelle in the mid-18th century
You have to give us more the question doesn’t make since