GMAT Critical Reasoning (CR) | The number of people diagnosed with dengue fever (which is contracted

The question stem is asking us for an option which does not weaken theconclusion...:

Conclusion : Mosquito control measures have failed and have lead to the increase in dengue cases.

Any option thatsupports the conclusion will be our answer.

Only option E strengthens the conclusion by giving reasons to prove that mosquito control measures have indeed failed and the incidence of malaria due to mosquito bites has actually increased.

Other options give reasons to prove that mosquito control
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