Okay... there is a generous thought of increasing profits for the Mongolian dairy owners: crossbreed native cows with European breed cows, so as to increase the production from 400 to 2700 litres. We need to weaken this plan. It essentially means we need to find some defect in the reasoning. May be the agency has not considered all parameters and situations. What if the mixed breed cows do not produce good quality milk, even if they produce more, or what if, the interbreeding induces some other major problem in the cows because of which the sale of milk reduces further, instead of increasing .
Looking at options :
A) This option tells us that only selected cows can be crossbred. But even then, does it actually impact the conclusion ?... I think no because we will be interbreeding only those cows which can be experimented on, is it not. Nowhere it is said that the population of these specific cows is too low etc. Incorrect choice.
B) If the situation is such that people are diverting their attention from dairy to other occupations, the interbreeding gives a reason to bring that attention back. But how does this knowledge help prove that the interbreeding will not be profitable as planned. Nowhere we get that link or relation . Incorrect choice.
C) This option tells us about one factor which could come in the way of profitability and the success of the plan. If the land from grazing is not good enough and the animals will not keep healthy, it will become difficult to produce good quality or healthy milk. A possible correct choice.
D) Other cow products form much of the exports of Mongolia. But how does it testify or make us believe that dairy will not sell if it is produced more. May be the domestic consumption will increase. This choice doesn't impact the conclusion. Incorrect.
E) Our focus should be on the Interbred cows and not how much European cows offer as milk. This knowledge won't be having an impact on the conclusion in anyway. Incorrect choice.
Correct answer choice should be C.