In the context of a two-sample z-test of proportions, which of the following is not a condition to check? Choose the correct option from the following:

A) Random Sampling: Ensure that both samples are randomly selected from their respective populations.
B) Normality: Confirm that the population distributions are approximately normal, or the sample sizes are sufficiently large.
C) Independence: Verify that the observations in one sample are independent of those in the other sample.
D) Equal Sample Sizes: Ensure that the sample sizes for the two groups are equal.
E) Homogeneity of Variances: Check that the variances of the populations from which the samples are drawn are equal.