In the following section, the passage consists of six sentences. The first and the sixth sentence are given in the beginnings as (S1) and (S6). The middle four sentences have been removed and jumbled up. These are labeled P, Q, R, and S. You are required to find out the proper sequence of the four sentences and select the appropriate option from given choices.
S1 : Pasteur began his fruitful scientific investigations when he was Professor of Chemistry at Strasburg.
S6 : The pasteurization process which he prescribed for wine and beer is used now to safeguard milk too.
P : He also found how germs causing changes in materials could be controlled by heat.
Q : He made a thorough study of the wine industry in France.
R : He thus saved the wine industry from ruin by his work.
S : After careful and extensive investigation he produced the germ theory of fermentation.
The proper sequence should be