choice D is correct.
A & B are wrong as mentioned in the explanation
A - I read should be followed by that and not wher
B - I read that two of the authors are both would have been correct if the following sentence had something liek "instructors and ...." but since the sentence mentions only about instructors both is not correct.
C - magazine does not say anything as displayed in choice C
D - correct - I read is followed by that and both is also not mentioned
E - two authors of are - sounds incomplete & awkward
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