A) So? 16 is also the age of consent in most states ....
B) it's simply not true. Some research may do you justice. all of your evidence revolves around something " taken off of some website." Man it doesn't matter if that's not what's happening. Find one case of a child under 15 undergoing SRS then we can talk about it as a problem, otherwise it's just imaginary.
C) I mean yes, the clitoris, but more broadly the vagina becomes the penis, for example the peehole. You can actually quite easily see sex as a spectrum if you examine different forms of intersex genitalia on a spectrum towards being either male or female.