A. I am speaking | B. I am writing | ||
C. I am a human being |
D. I am not sure | ||
(A) looks as though it might be 'self-validating' in this sense.
What about (C)? If we are talking about 'someone' saying 'I am a human being' would that not be self-validating? But it doesn't become true on being uttered ...
(D) might be false
(B) probably is.