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As a non-native English speaker, I'd say D. First because the correct answer is always the D (har har). Secondly because otherwise it would have been two zeroes two threes (for example).
I am a native English speaker and I agree
E. none of the above you'd probably read D. "two O' two three"
Because I deal with a lot of part, model and serial numbers at work, zero and "O" need to said.