The demand for quinine, an ancient Peruvian

akhp77 wrote:Source: Veritas Prep CR-1

Q41.
The demand for quinine, an ancient Peruvian derivatives from the cinchona tree used to threat malaria, is slowly diminishing in Sub-Sahara Africa. Since quinine is still one of the most cost-effective antimalarial drugs to produce, government official in Sub-Sahara African nations attribute the decrease in demand to their active insecticide campaign against the anopheles mosquito, the primary vector for transmitting the disease.

Which of the following, if true, would most seriously weaken the argument officials' explanation for lower demand for quinine?

A: Spraying the interior walls of leaving structures with insecticide is much more cost-effective than wide-scale field spraying.
B: Mosquito nets have been shown to greatly reduce the rate of malarial infection, but only 1 out of 20 people in Africa own a bed net.
C: A mutated strain of malaria, resistant to quinine, has spread into Africa from Asia within the last few decades.
D: More than 1.7 million people die of malaria every year in Sub-Sahara Africa composing almost 90% of all worldwide maria deaths.
E: Massive insecticide spraying against malaria took place in many regions of Africa in the 1950s, with mixed results.

Please explain.

akhp77 wrote:Source: Veritas Prep CR-1

Q41.
The demand for quinine, an ancient Peruvian derivatives from the cinchona tree used to threat malaria, is slowly diminishing in Sub-Sahara Africa. Since quinine is still one of the most cost-effective antimalarial drugs to produce, government official in Sub-Sahara African nations attribute the decrease in demand to their active insecticide campaign against the anopheles mosquito, the primary vector for transmitting the disease.

Which of the following, if true, would most seriously weaken the argument officials' explanation for lower demand for quinine?

A: Spraying the interior walls of leaving structures with insecticide is much more cost-effective than wide-scale field spraying.out of scope. Our focus is not on which spraying is effective
B: Mosquito nets have been shown to greatly reduce the rate of malarial infection, but only 1 out of 20 people in Africa own a bed net.Mosquito nets could have been a reason, that people are not buying the medicine, but second part says that not much people have bought
C: A mutated strain of malaria, resistant to quinine, has spread into Africa from Asia within the last few decades. could be a reason to weaken
D: More than 1.7 million people die of malaria every year in Sub-Sahara Africa composing almost 90% of all worldwide maria deaths. the numbers refute the official's explanation
E: Massive insecticide spraying against malaria took place in many regions of Africa in the 1950s, with mixed results.
out of scope
Please explain.