请教一道LSAT中关于Dietary fiber的题

请问哪位高人可解下面这道题？

Lourdes: Dietary fiber is an important part of a healthful diet. Experts recommend that adults consume 20 to 35 grams of fiber a day.

Kyra: But a daily intake of fiber that is significantly above that recommended level interferes with mineral absorption, especially the absorption of calcium. The public should be told to cut back on fiber intake.

Which one of the following, if true, most undermines Kyra's recommendation?

A. Among adults, the average consumption of dietary fiber is at present approximately 10 grams a day.

B. The more a food is processed, the more the fiber is broken down and the lower the fiber content.

C. Many foodstuffs that are excellent sources of fiber are economical and readily available.

D. Adequate calcium intake helps prevent the decrease in bone mass known as osteoporosis.

E. Many foodstuffs that are excellent sources of fiber are popular with consumers.

你是新手，请看看置顶帖的“发帖必读”，修改一下标题

原文推理：推荐每天吃20-35克FIBER，但吃必这个量高的多不好。所以应该告诉公众减少吃FIBER。

C：现在大家才吃10克每天。所以不该减少，而是要增加，削弱结论。

多谢！！！ 下次注意。

好像有点明白了。