|Question 10Verbal

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Stephen Machado and colleagues found that tilling—the practice of turning soil with hoes, plows, or other machines before planting crops—was associated with an increased yield of spring barley. But some studies of other crops have found the opposite effect, raising the question of whether the increase in yield found by Machado and colleagues is specific to their study crop. However, this doesn't seem to be the case: _____
Which choice most effectively uses data from the table to complete the assertion?
Amos Ngwira and colleagues found a similar association in a study using maize.
A
a study using spring barley yielded 3,960 kilograms per hectare with tilling and only 1,230 kilograms per hectare without tilling.
B
Min Huang and colleagues reported an even larger positive effect of tilling on the yield of rice.
C
crop yields with tilling have ranged from 2,024 kilograms per hectare for winter wheat to 3,960 kilograms per hectare for spring barley.
D