Listening Passage Mona Lisa

The theory that could possibly be true is that the Mona Lisa was a self-portrait of Leonardo Da' Vinci. For example, according to the story it said that a man using a computer found out that Mona Lisa was identical to Leonardo,which means that he made a self-portrait of himself as a woman.I think that the other choice are less possible to be true because if the portrait was so famous back then,and the woman really exist people would have seen her.