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Verbal·Information and Ideas·Inferences

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Exclusively inhabiting tropical countries such as Tanzania, wild chimpanzees lack adaptations to seasonal variations in ultraviolet B (UVB) irradiance from sunlight, since UVB exposure enables vertebrates to synthesize vitamin D. This raises questions about how chimpanzees in mid-latitude zoos are affected by the lower and more variable UVB irradiance in those locations. In a study of zoo chimpanzees in France and other mid-latitude countries, Sophie Moittie and colleagues found not only that chimpanzees’ vitamin D levels correlate with UVB irradiance but also that vitamin D levels show no evidence of plateauing as UVB irradiance reaches its highest local levels, suggesting that       

Which choice most logically completes the text?

A

adaptations to seasonal variations in UVB irradiance may be emerging in zoo chimpanzees in France and other mid-latitude countries.

B

averaged across seasons, vitamin D levels in zoo chimpanzees in mid-latitude countries such as France tend to be comparable to those in wild chimpanzees in tropical countries such as Tanzania.

C

providing supplemental vitamin D to chimpanzees in zoos in France and other mid-latitude countries would likely not be beneficial.

D

zoo chimpanzees in France and other mid-latitude countries could likely synthesize more vitamin D if they were exposed to higher levels of UVB irradiance.