"A campaign can perfectly well be conceived in which an opponent, consciously inferior in the field, will avoid action throughout, and by such a plan can actually win the campaign in the end." How does this sentence function in this passage? A) It gives an example of a typical case which shows the soundness of the author’s thesis.
B) It gives an example of an unusual case which shows the soundness of the author’s thesis.
C) It gives an example of a typical case which undermines the soundness of the author’s thesis.
D) It gives an example of an unusual case which is completely different from the author’s thesis.