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Reading Comprehension - Authentic Questions Passage 55

老師,能解釋一下為什麼答案是D嗎?我選了A。
Some observers have attributed the dramatic growth in temporary employment that occurred in the United States during the 1980s to increased participation in the workforce by certain groups, such as first-time or reentering workers, who supposedly prefer such arrangements. However, statistical analyses reveal that demographic changes in the workforce did not correlate with variations in the total number of temporary workers. Instead, these analyses suggest that factors affecting employers account for the rise in temporary employment. One factor is product demand: temporary employment is favored by employers who are adapting to fluctuating demand for products while at the same time seeking to reduce overall labor costs. Another factor is labor’s reduced bargaining strength, which allows employers more control over the terms of employment. Given the analyses, which reveal that growth in temporary employment now far exceeds the level explainable by recent workforce entry rates of groups said to prefer temporary jobs, firms should be discouraged from creating excessive numbers of temporary positions. Government policymakers should consider mandating benefit coverage for temporary employees, promoting pay equity between temporary and permanent workers, assisting labor unions in organizing temporary workers, and encouraging firms to assign temporary jobs primarily to employees who explicitly indicate that preference.

Question:
The passage mentions each of the following as an appropriate kind of governmental action EXCEPT
A. getting firms to offer temporary employment primarily to a certain group of people
B. encouraging equitable pay for temporary and permanent employees
C. facilitating the organization of temporary workers by labor unions
D. establishing guidelines on the proportion of temporary workers that firms should employ
E. ensuring that temporary workers obtain benefits from their employers

这题很简单呀:
A. 对应:encouraging firms to assign temporary jobs primarily to employees who explicitly indicate that preference, A中的“certain group of people”就是 “employees who explicitly indicate that preference”
B 对应 promoting pay equity between temporary and permanent workers
C 对应assisting labor unions in organizing temporary workers
D 无对应,未提及
E 对应 mandating benefit coverage for temporary employees