Critical Reasoning

Magazine Publisher: Our magazine does not have a liberal bias. It is true that when a book review we had commissioned last year turned out to express distinctly conservative views, we did not publish it until we had also obtained a second review that took a strongly liberal position. Clearly, however, our actions demonstrate not a bias in favor of liberal views but rather a commitment to a balanced presentation of diverse opinions.

Determining which of the following would be most useful in evaluating the cogency of the magazine publisher's response?

A.Whether any other magazines in which the book was reviewed carried more than one review of the book?
B.Whether the magazine publishes unsolicited book reviews as well as those that it has commissioned?
C.Whether in the event that a first review commissioned by the magazine takes a clearly liberal position the magazine would make any efforts to obtain further reviews?
D.Whether the book that was the subject of the two reviews was itself written from a clearly conservative or a clearly liberal point of view?
E.Whether most of the readers of the magazine regularly read the book reviews that the magazine publishes?

OA: C

can someone explain this? and how to eliminate to the right answer

thank u!!!

Magazine publisher concludes that the magazine is not biased to liberal views but they are rather inclined to diverse opinion. He concludes this because the 2 reviews ended up giving 2 different positions.

We need to search for an option that questions publisher's point: "magazine is not biased to liberal views".

IMO - A,B,and E are irrelevant.
among C and D, answer to option D would not give us any hint if the magazine is biased to liberal views. And answer to option C will help us determine if the magazine is biased towards liberal view because if the first review turns out to be liberal and then if the magazine doesn't go for second review, then it is clear that magazine is biased towards the liberal views.