Select the correct answer from the list. Use digital reference materials to help you.

response
One by one, the students in the classroom next to the science lab began to look up and response deeply at first and then quickly cover their noses. Something was going terribly wrong in the science lab, and the smell was beginning response the other classrooms on the hall

The correct answer is "to affect." The sentence suggests that the smell from the science lab was starting to have an impact on the other classrooms in the hall.