An assumption inherent in classical test theory (CTT) is that
A. testtakers can be ranked according to the level of the trait or ability that they exhibit in much the same way that rankings can be made by height.
B. measurement can be perfectly accurate if the measuring tool is well-constructed.
C. each testtaker has a true score that would have been obtained if not for measurement error.
D. All of these
Answer: C
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