Girl B had some gene where they didn't / wont stop growing - she started seeing doctors when she was about 16 and was DDD, by the time she was 18 they were E... they did not do a "big reduction" because they still again, wont stop- and if she were to take them down to even E->C/D when they regrew, skin still only stretches so much even while "growth" makes new - so yeah, this girl has a medical condition and was like 5ft if that, and a stick.
Girl A has like, maybe DD is like 5 foot 7 or so and "curvy thick" her boobs matched, looked fine, big sure but not OMG what the heck?! - her grand parents where youth leaders at church when my wife and I grew up- we grew up with A's mom- - A's mom's parents (the youth leaders at church) are both very thin super athletic people, they had 2 girls, 1 a thin rail and the 2nd (A's mom) a more "thick" curvy girl.... think of growing up in that... and to add context, I am a big guy, always have been- A's Mom's Dad (the youth leader guy) took me aside one day and this is a direct quote "Don't you want to work out more? get thin? Look at my wife, she is thin and hot... Don't you want a hot wife like that? You need to loose weight, get fit like me if you want a hot thin wife." I was like, I dunno 12? wtf is that... "Oh her back!" is always the reason, I really think this is influenced and seen that "the boobs" are what are making her "fat" in their eyes and trimming them down will fix that.
I searched google for before and after, and none of them are "Those boulders will kill anyone's back!" every one was more of a "lift" and restructure to be the "no dangle!" boobs not, some kind of EE/EEE's getting taken down to DD levels.