OG SC question

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OG SC question

by ankit0703 » Mon Oct 15, 2012 9:35 am
Laboratory rats and mice live up to 40 percent longer than usual when fed a diet of at least 30 percent fewer calories than that which they would normally eat, but that otherwise contains all necessary vitamins and nutrients.

Option e. that has at least 30 percent fewer calories than that which they would normally eat, though that otherwise

In the above option why "than that which" is wrong?
Source: — Sentence Correction |

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by Jim@StratusPrep » Tue Oct 16, 2012 9:25 am
It is just excessive. You can simply say "than they would normally eat."
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