The argument that strategic planning is NOT likely to be practical due to insufficient information means that _________.
选项：

A:because of trade secrets, the government does not know true cost relationships in any given industry.;
B:if the government had all the relevant information in a given industry then it could decide whether a subsidy would enhance the public's welfare.;
C:even if the government had all the relevant information in a given industry, it still could not decide whether a subsidy would enhance the public's welfare.;
D:due to recent cuts in the Department of the Census' sampling budgets, industry surveys are no longer reliable, so that there is no way to determine if a subsidy is in the public's interest.