Respuesta :
The author never mentions Da Vinci's failures or bad quality's, which makes it biased because not all the info is there to read.
Da Vinci was the world’s greatest genius. He mastered nineteen professions. It’s a feat no ordinary man could accomplish easily, if at all.
this is the answer because when the writer says "world's greatest genius" it implies that there will never be a genius greater than Da Vinci which is a bias statement since its an opinion.