In which way did joseph lister improve standards during the industrial revolution?

I Have The Hole Assesment 

1) Which of the following had the greatest impact on transportation during the second industrial revolution?
C) the Bessemer process 2) Which factor caused the population of Europe to soar between 1800s and 1900s?
D) medicine advanced, and the death rate fell 
3) Why did some workers organize unions?
D) to improve their working conditions 
4) which of the following was a consequence of the second industrial revolution?
 B) new sewer systems decreased death rates 
5) Which of the following is a difference between the first industrial revolution and the second? 
D) the first led to rapid growth of cities while the second had most of their workers living in the suburbs 
6) In which way did Joseph Lister improve standards during the industrial revolution?
A) he discovered that infections could be prevented with antiseptics
7) Which of the following statements describes the changing relationship between business and labor during the 1800s? 
C) the increasing need for skilled labor made it necessary for big business to listen to the demands of workers
8) How did population distribution change as a result of industrial revolution?
 D) cities grew rapidly as people moved from rural areas to work in the industry
9) Which factor changed the layout of large cities during the second industrial revolution?
C) the desire by city planners to integrate different social classes and ethnicities 

They said that the world was flat