Please help !! You've chosen Louis Pasteur as a subject for an essay on the germ theory of disease, but you haven't narrowed your topic yet. To search for sources in the library's catalog search page, you should begin with a/an search. A. call number
B. author
C. keyword
D. title

To search for sources in the library's catalog search page, you should begin with a/an search.

B. author

Explanation:

The search should be concentrated on Louis Pasteur, who is the author of the germ theory of diseases.  Therefore, the search for sources of information should be concentrated on the author.  As the search goes on more information will surely be discovered about Louis Pasteur, his discoveries about germs, and more importantly, his conclusions on the germ theory of diseases.

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