After we lit the busen burners, we were able to add the chemicals
Answer:
Lit up is the correct answer.
Explanation:
If a word needs to be replaced in a sentence it is because the meaning in context might be ambiguous, making the understanding a little bit more difficult. In this case, the expression lit up might refer to be animated because of something, but the idea of the passage is not that one, but that the people used a device to start the fire in the Bunsen burners.
