What did Martin Kemp do to Bianca Sfroza？A．He refused to believe it to be a Leonardo when

What did Martin Kemp do to Bianca Sfroza？

A．He refused to believe it to be a Leonardo when seeing the digital image.

B．He examined the layers with the help of high-resolution multispectral scans.

C．He collected enough evidence to make all other scholars convinced.

D．He found the identification of the drawing, which was written down in Sforziad.

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