Umm plant A might be male but plant b has no real indicators i can see
I grew a male and female once and the male was identical to the female until I saw something that looked like the "Clubs" on cards ya know
What Im saying is dont give up on Plant A yet until the clusters begin and B just has NO indicators pistils are VERY evident they spring out overnight at EVERY bud site so its not hard to tell the difference , its kind of a waste to guess at the sex
dont cut down A