When testing for differences between two means, the Behrens-Fisher problem arises when the sample populations are

16) When testing for differences between two means, the Behrens-Fisher problem arises when the sample populations are
A. normal with equal variances.
B. are non-normal and have equal variances.
C. are normal with unequal variances.
D. are non-normal and have unequal variances.
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