Which of These Sets of Samples Would Qualify as Meeting

Multiple Choice

Which of these sets of samples would qualify as meeting the assumption of sample size equality for calculating a "pooled estimate" in a two-sample hypothesis test?

A) sample 1: n = 200; sample 2: n = 45
B) sample 1: n = 500; sample 2: n = 300
C) sample 1: n = 800; sample 2: n = 350
D) sample 1: n = 1500; sample 2: n = 650