Respuesta :
Answer:
The answer is:c
Explanation:
I did it on the quiz and got it correct on k12.
The sentence that could be added to the passage and maintain its formal style is C. Pretty soon, penicillin was being used in a bunch of stuff that treats infections.
What is Informal Language?
This refers to the type of language that is used in both speech and writing to communicate to acquaintances and friends and makes use of loose diction.
Hence, we can see that to transform the passage to a more informal tone without losing meaning, then option C is the correct answer because it uses the words "pretty soon" and "bunch of stuff".
Read more about informal language here:
https://brainly.com/question/14077232