The correct answer is c: "the claim that people may be saving the bees to death."
This option directly relates to the idea that human actions, possibly in the form of well-intentioned interventions, are contributing to the decline of bumblebees.
The wrong answers are:
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a: "the study that shows viruses may be spilling over from commercial hives to wild bees" - While this suggests a connection between management practices and virus transmission, it does not directly imply that human actions are causing the decline.
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b: "the question about how wild bees pick up viruses if they do not enter managed honeybee colonies" - This raises a question but does not provide evidence that human actions are related to the decline.
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d: "the fact that people have tried to breed more bees" - This merely states an action taken by humans without demonstrating how it relates to the decline of bumblebees.