(A) It was a time when managers had to take a critical look at every aspect of their production process and make improvements where necessary.
(B) As a result, some people believe it is now time to re-assess many companies in terms of the standards they agreed to some years ago.
(C) In the late 1900s. food manufacturers were challenged by the organic community to ensure they were using ingredients that had been produced in natural healthy ways.
(D) Whether these systems have been maintained seems questionable, particularly as contracts depend so heavily on efficiency and quick sales.
(E) Over the last half-century, organic farming has become a driving force in the world's food market.
A段在强调一段时期(it was a time)。但是并没有给出一个明确的话题，容易让读者摸不清头绪。而且文中提到的managers 也没说清楚是哪来的。
B段在讨论结果是什么(as a result)。而且从内容的表达方式来看，some people believe… 这是在表达观点，换句话说，这就是在解释细节。
D段these systems 是代指某部分，绝不可能出现在首段!
E段提出了organic farming 这个话题。所以这题不难发现E是首段。
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