Cloud seeding is accomplished by dropping particles of dry ice (solid carbon dioxide) from a plane onto super-cooled clouds. This process encourages condensation of water droplets in the clouds, which usually, but not always, results in rain or snow. From this passage, it's reasonable to assume that:

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Accepted Answer

One can assume that causing rain or snow would end a drought. Nothing in the passage has to do with expense, so ChoiceB.is incorrect. The passage says nothing about how frequently the process is used, so ChoiceC.is incorrect. The passage specifies that dry ice (solid carbon dioxide) is used; solid water (regular ice) is a different chemical, so ChoiceD.is wrong.

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