“A”
Maybe because this is a very common model and there has been numerous reviews, it comes in 2 brands and several battery tubes styles. Also, both brands are heavy on the M4P policy!!
It’s a triple XP-G2 light with integrated micro USB charging in the battery tube. I have the 16340 version and it makes 1100+ lumens in stock form.
I prefer B because of shorter length.
You want it short, you get it short. 
A
A
A
Read OP. :-}
B
A
C 18650 and well heck just toss in a shorter tube for A or B if you insist 
B
A
A
Both
A
A, but really both.
A
C. 18650 if available
18650 version is too ex.
A