Assuming Unequal Variances in a T-Test for a Zero Difference

Multiple Choice

Assuming unequal variances in a t-test for a zero difference of two means, we would:

A) sum the degrees of freedom for each sample.
B) use the larger degrees of freedom for simplicity.
C) use a complicated formula for the degrees of freedom.
D) use a z-test to be conservative in the calculation.