Run by researchers in multiple countries, the Study on Global Ageing and Adult Health (SAGE) is an examination of aging that has attempted to track approximately 66,000 people for several years. Long-running studies like this need a lot of participants not merely for statistical robustness but also because of __________: over such a length of time, a substantial number of participants will withdraw or fall out of contact with the researchers.
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Verbal·Craft and Structure·Words in Context
hardWhich choice completes the text with the most logical and precise word or phrase?
A
impartiality
B
replicability
C
attrition
D
circumspection