LSAT 11-IV-9 help

dandan74

这道题怎莫也想不通，答案怎莫是D呢？
9. There is relatively little room for growth in the overall carpet market, which is tied to the size of the population. Most who purchase carpet do so only once or twice, first in their fifties or sixties. Thus as the population ages, companies producing carpet will be able to gain market share competitors, and not through more aggressive marketing.
Which one of the following, if true, casts the most doubt on the conclusion above?
(A) Most of the major carpet producers market other floor coverings as well.
(B) Most established carpet producers market several different brand names and varieties, and there is no remaining niche in the market for new brands to fill.
(C) Two of the three mergers in the industry’s last ten years led to a decline in profits and revenues for the newly merged companies.
(D) Price reductions, achieved by cost-cutting in production, by some of the dominant firms in the carpet market are causing other producers to leave the market altogether.
(E) The carpet market is unlike most markets in that consumers are becoming increasingly resistant to new patterns and styles.

dorbear

你的原题不完整，看下面原文：

There is relatively little room for growth in the overall carpet market, which is tied to the size of the population. Most who purchase carpet do so only once or twice, first in their twenties or thirties, and than perhaps again in their fifties or sixties. Thus as the population ages, companies producing carpet will be able to gain market share in the carpet market only through purchasing competitors, and not through more aggressive marketing.

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dandan74

能给解释一下吗，还是有些糊涂。为什末是D呢? What is the conclusion of this argument?