Macsen wrote:
Deep tillage is even more deliterious to the world's topsoil supply than previously believed. For example, farmers who till deeply are ten times more likely to lose topsoil to erosion than are farmers who use no-till methods. Results like these make it clear that farmers who now till deeply should strive, by using other topsoil aeration techniques, to incorporate no-till methods instead.
The argument depends on assuming which one of the following?
A. Topsoil erosion does not make farmers want to till more deeply.
B. In deep-tillage farming, the deeper one tills, the greater the susceptibility to topsoil erosion.
C. Tilling by any method other than deep tillage is not a viable option.
D. The most expensive farming methods employ topsoil aeration techniques other than deep tillage.
E. On average, topsoil that is no-tilled is more aerated than topsoil that is tilled deeply.
Responding to a pm:
The argument is about what the farmers should do and not about what they want to do. Hence option (A) is out of scope.
Premises:
Deep tillage causes top soil erosion.
Farmers who till deeply are 10 times more likely to lose top soil than farmers who don't till.
Conclusion:
Farmers should use no till methods for top soil aeration.
Look at the last sentence: Results like these make it clear that farmers who now till deeply should strive, by using other topsoil aeration techniques, to incorporate no-till methods instead.
This tell us that tilling is a 'top soil aeration technique'. Tilling deeply is bad so farmers should use no till methods. The author has jumped from deep tilling to no till. He says that just don't till at all since deep tilling is bad for top soil. He assumes that there are no methods of tilling (which may not be bad for top soil) other than deep tilling.
Therefore, the assumption of the author is "Tilling by any method other than deep tillage is not a viable option."
Answer (C)
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