Sentence Correction

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.

(A) of at least 30 percent fewer calories than that which they would normally eat, but that otherwise

(B) with at least 30 percent fewer calories than what they would normally eat though otherwise it

(C) that has at least 30 percent fewer of the calories that they would normally eat, but otherwise it

(D) that has at least 30 percent fewer calories than they would normally eat but that otherwise

(E) that has at least 30 percent fewer calories than that which they would normally eat, though that otherwise

This is a comparison test. The right answer must accurately compare the number of calories in the new diet to the number of calories in the usual diet.

There is also a meaning test. It doesn't make sense to say "a diet of calories"; it makes more sense to say "a diet that has calories"

Finally, parallel structures are tested because there is a contrast as indicated by "but / though"

The full solution below is taken from the GMATFix App.



-Patrick