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Verbal·Craft and Structure·Words in Context
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The preponderance of studies on aqueous uranium (U)—including a 1997 study by Moran et al.—were in oceanic contexts. In a 2020 investigation of factors influencing the abundance of the isotope U-238 in Xiligou Lake and three other lakes in northwest China, Zhao et al. therefore aimed to address the relative        of scientific knowledge on uranium isotopes in inland bodies of water.
Which choice completes the text with the most logical and precise word or phrase?
A
aggregation
B
obsolescence
C
diminution
D
dearth