Correct Option (d)
The passage attributes the continued widespread use of chemical pesticides, despite known problems, to two primary factors:
- The favorable cost-benefit ratio for individual agricultural producers, exemplified by an estimated $5 benefit for every $1 spent in the USA.
- In many poorer countries, the imperative to avert mass starvation or epidemic diseases compels the use of pesticides, often overriding concerns about social and health costs.
Since options (a), (b), and (c) do not accurately reflect these reasons as presented in the passage, option (d) is the correct choice.
Incorrect Options:
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Option (a): Alternatives to chemical pesticides do not exist at all. The passage implies the existence and ongoing development of alternatives by stating that "sustainability depends on continually developing new pesticides that keep at least one step ahead of the pests pesticides that are less persistent, biodegradable and more accurately targeted all the pests." This indicates that efforts are made to find improved solutions, not that alternatives are entirely absent.
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Option (b): New pesticides are not invented at all. This statement is directly contradicted by the passage, which explicitly mentions that "sustainability depends on continually developing new pesticides."
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Option (c): Pesticide are biodegradable. The passage indicates that biodegradability is a desired characteristic for new pesticides ("less persistent, biodegradable"), implying that many existing pesticides may not be inherently biodegradable. The justification for their widespread use is rooted in economic efficiency and food production, not their biodegradability.