A public health researcher studying the 1918 influenza pandemic's impact on Oklahoma finds that rural communities were severely affected. What factor made rural Oklahomans particularly vulnerable?
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A
Rural Oklahomans had higher rates of pre-existing lung disease from coal mining
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B
Limited medical infrastructure and isolation delayed both treatment access and public health interventions
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C
Rural areas received contaminated water supplies from urban centers
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D
Oklahoma's warm climate accelerated the spread of the virus in rural settings