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Verbal·Craft and Structure·Words in Context

hard

Run by researchers in Australia, the Longitudinal Study of Indigenous Children (LSIC) is an examination of childhood development that has attempted to track approximately 1,700 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.

Which choice completes the text with the most logical and precise word or phrase?

A

impartiality

B

replicability

C

attrition

D

circumspection