So strange. Someone invented a computer language called C and is not proper C until it is stabdardised by a committee. I would say the original C is proper C. Got a whole operating system to run with it.
Organisation is nothing if we do not accept individual’s role.
Not the subset you can fit onto a 6502, thus that subset fits the same purpose as K&R C, a portable macro assembler, calling into functions that are written in raw Assembly, compiled by an external macro Assembler.
And good luck making good use of 6502 registers for C code.