Which one is a man and why ?

I could make a case for all of these being men but none of the reasons give a definitive answer
a. Has the largest hands and no obvious waist.
b. Looks like she has a wig on.
c. Standing so she isn't crushing her balls.
d. Could be a woman
but is it to do with how they identify?
Are they all bio men?
There is no way to identify if any or none are women from that picture.