GMAT Question of the Day:Critical Reasoning

The proportion of manufacturing companies in Alameda that use microelectronics in their manufacturing processes increased from 6 percent in 1979 to 66 percent in 1990. Many labor leaders say that the introduction of microelectronics is the principal cause of the great increase in unemployment during that period in Alameda. In actual fact, however, most of the job losses were due to organizational changes. Moreover, according to new figures released by the labor department, there were many more people employed in Alameda in the manufacturing industry in 1990 than in 1979.Which of the following, if true, would most strengthen the labor leaders’ claim concerning the manufacturing industry in Alameda?

(A) From 1979 to 1990, fewer employees of manu- facturing companies in Alameda lost their
jobs because of the introduction of microelec- tronics than did employees of manufacturing
companies in the nearby community of Rockside.
(B) The figures on the use of microelectronics that were made public are the result of inquiries
made of managers in the manufacturing industry in Alameda.
(C) The organizational changes that led to job losses in all sectors of the manufacturing
industry in Alameda were primarily the result of the introduction of microelectronics.
(D) Figures on job losses in the manufacturing industry in Alameda for the late sixties and
early seventies have not been made available.
(E) A few jobs in the manufacturing industry in Alameda could have been saved if workers
had been willing to become knowledgeable in microelectronics.