Question

born in 1822, louis pasteur was a french scientist. he invented a process, now called pasteurization, for preventing diseases caused by drinking raw milk. one of pasteur’s key discoveries was the role that bacteria play in contaminating milk and other beverages. pasteur applied this knowledge to the development of a method for removing bacteria from milk. during the process, milk is heated to a high temperature for a short time, killing harmful bacteria. starting in the 1920s, milk was routinely pasteurized in the united states. the practice became widespread by 1950. the use of pasteur’s process has prevented countless people from becoming ill.
which sentence best helps readers understand the revolutionary impact of pasteurization?

1. \he invented a process, now called pasteurizing, for preventing diseases caused by drinking raw milk.\
2. \one of pasteur’s key discoveries was the role that bacteria play in contaminating milk and other beverages.\
3. \starting in the 1920s, milk was routinely pasteurized in the united states.\
4. \the use of pasteur’s process has prevented countless people from becoming ill.\

Explanation:

To identify the sentence showing the revolutionary impact of pasteurization, we need to focus on the large-scale, life-changing effect of the process. Option 1 explains what pasteurization is, Option 2 describes a key discovery leading to it, Option 3 notes when it became routine, while Option 4 directly states the significant, widespread benefit of preventing countless illnesses, which reflects its revolutionary impact.

Answer:

1. "The use of Pasteur's process has prevented countless people from becoming ill."