D还原一下:.... companies address forecasting difficulties in which way....
in ... way = how/ methods
where does it ever mention HOW any company addressed such difficulties (let alone an EXAMPLE)? my interpretation is: the passage only presented PROBLEMS, no solutions.
反正我要是遇到此题,我肯定选C. whoever thinks otherwise, please feel free to make ur own choice.
1. assertion: 不是说assert的东西一定对/好:它只是稍微强烈的(比think...强)态度。think of it as "i'm positive / certain ..." 在这里作者assert的是 frequent introductions of new products have two problematic side effects中的一个
2. ability不代表一个东西一定capable。比如:our ability to finish gmat in 2 hours is extremely weak. 这里也一样,accurately forecast demand by individual SKU 的ability 不够好。
hope this helps, but again, make your own decisions please.