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Bookkeeper from heaven
The answer is c, and the process is as follows:

The work done in the process of fetching books is: 5n *1.3m = 6.5j.

The height of the book from the "embrace" is:1.3m-0.4m = 0.9m.

The work done in the process of putting books is: 0.9m * 5N = 4.5J.

The total work is: 4.5j+6.5j =11j.

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