X-ray examination of a recently discovered painting—judged by some aut

In the argument presented, X-ray of painting reveals presence of underimage of women. He further makes conclusion that Because another painting that has similar kind of underimage, we can safely say that Original painting in question was painted by Van Gogh. Now to make this conclusion author must assume that(pre-thinking):
This is painting style that is only used by Van Gogh.
Keeping this in mind lets analyze options:
Quick analysis:
A. Naaaahhhh
B. May be
C. May be
D. This doesn't talks about if we can relate the painting in question to Van gogh or not. This is just a fact statement. So I won't pick this.
E. No.

Because B C are very close, we must call negation technique to finalize options.
Negate B: (None/less that 50%) painted canvases that can be reliably attributed to van Gogh contain underimages of subjects that appear on at least one other canvas that van Gogh is known to have painted.
If None of the paintings, which belong to Van Gogh, contains underimage: then conclusion breaks.....It is good
Just because we have "many paintings" written in option, there is another possibility to be evaluated: if some i.e. 1 or 2 paintings that is attributed to Van Gogh contains underimage, Conclusions strengthens....Nope This can not be our assumption.

Negate C:
Any painted canvas incorrectly attributed to van Gogh would contain an underimage of a subject that appears in authentic paintings by that artist.
So, if other artist paintings also contains underimage, my conclusion breaks. This must be my answer.