Official Solution:
United States manufacturers currently produce most of the world's solar-power generators--most of which are exported to Europe. However, European manufacturers are emerging and probably will ultimately capture much of the European market. The United States government is funding initiatives intended to encourage use of solar power within the United States. If these initiatives succeed in increasing the demand for solar-power generators in the United States, United States manufacturers will probably maintain significant production levels, since __________.
Which of the following most logically completes the argument?
A. some United States manufacturers have been substantially increasing their output over the last several years
B. the efficiency of solar-power generators in converting energy from the Sun into electric power is not improving as fast as it once did
C. just as European manufacturers enjoy certain competitive advantages in Europe, so do United States manufacturers in the United States
D. European governments are currently undertaking initiatives to stimulate the use of solar power within Europe
E. the current market for solar-power generators in the United States is very limited
Fact 1: United States manufacturers currently produce most of the world's solar-power generators--most of which are exported to Europe.
Fact 2: However, European manufacturers are emerging and probably will ultimately capture much of the European market. (Assumption – It will reduce the US exports to Europe)
Fact 3: The United States government is funding initiatives intended to encourage use of solar power within the United States.
Conclusion: If these initiatives succeed in increasing the demand for solar-power generators in the United States, United States manufacturers will probably maintain significant production levels, ...
We can see in the 3rd fact that Author has stated that the US Govt has taken initiative to boost up sales of solar power in the US. This clearly indicates that the demand for solar power generators is currently not high enough to accommodate the produce of US generator manufacturers. (This is what Choice E says)
Then Author has concluded that if govt's initiatives succeed in increasing the demand for solar power generators, US manufacturers will probably maintain significant production level. Here the author has assumed that the increased demand of solar power gensets will be fulfilled by supplies of US manufacturers. So next logical premise would eliminate the possibility of fulfillment of increased demand by sources other than US manufacturers.
Choice C does that job and hence is the correct answer.
Answer: C