1st off if that 4th plant had leafs taken off it? dont do that. in the beggining the plant needs every bit of growth it can get. until you have 5 or 6 sets of leafs then you can topp it , the pics are too early to tell, maybe if you got a picture of where the branch and fan leaf meet the stem. thats where we will find preflowers. basic rule. if you see 2 white hairs coming froma pod inbetween the stem leaf and branch its a girl. if it grows what looks like clusters of grapes its a boy.
just a side note: when you remove the plants leafs in early growth you take away its ability to grow, thus destroying the plant. there are certain ways to prune and cut a plant for benefit, but none of that starts till 6 leaf sets.
theres a pic of a close up of where you need to check for preflowers. take a pic of that spot and well be able to tell.
that one is deff a male chop it