It is crucially important to farmers that the herbicides they use to control weeds not damage their crops. One very effective herbicide is safe for corn, but soybeans are damaged even by the herbicide's residue, which remains in the soil more than a year after the herbicide is applied. Soybeans and corn are not sown together in the same field; nevertheless, most farmers are reluctant to use the herbicide on their corn.
Which of the following, if true, provides the strongest justification for the farmers' reluctance?The correct answer to this Strengthen question will provide information that justifies farmers' reluctance to use the herbicide on their corn fields, even though "Soybeans and corn are not sown together in the same field."
(A) The residue of the herbicide in the soil a year after application is not enough to control most weeds effectively.The fact that the residue remaining in the soil after a year does not control weeds doesn't mean that the herbicide does not control weeds during a growing season in which it's applied.
So, this is not a reason not to use the herbicide.
Eliminate.
(B) To maintain the nutrients in the soil, corn and soybeans are often planted in a field in alternate years.The passage says the following:
soybeans are damaged even by the herbicide's residue, which remains in the soil more than a year after the herbicide is applied Given that fact, this choice means that there's a disadvantage to using the herbicide on corn fields even though, as the passage says, it is "safe for corn."
After all, if farmers use the herbicide when they grow corn, they won't be able to grow soybeans in the same field the next year to maintain nutrients in the soil, as this choice indicates they often do.
Thus, this choice provides a reason for farmers' reluctance to use the herbicide.
Keep.
(C) The demand for soybeans is growing faster than is the demand for corn.This choice could support not growing corn at all and growing soybeans instead, but it doesn't support reluctance to use the herbicide on cornfields after a farmer has decided to grow corn.
Eliminate.
(D) For maximum yield, soybean plants are grown closer together to each other than are corn plants.The fact that soybean plants are grown closer to each other than corn plants would not be a reason not to use the herbicide on corn fields.
If anything, the wider spacing of corn plants would be a reason to use the herbicide to prevent weeds from growing between corn plants.
Eliminate.
(E) The application of herbicides is less critical for soybean than for corn crops.Basically, this choice means that application of herbicides is relatively critical for corn crops.
So, if anything, this choice does the opposite of what the correct answer must do, by providing a reason to use the herbicide on corn fields.
Eliminate.
Correct answer: B