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C was created to port Unix V6 into PDP-11 hardware, after a couple of failed attempts with B.

v4 was the first kernel written in C, and the assembly kernel before that already ran on a PDP-11. I doubt anyone even considered using B for this.

I stand corrected, it was v4 and not v6, yeah.

For a while they used improved B versions, what Dennis calls New B, Embryonic C and Neonatal C, regarding the language evolution.