One of the effects of lead poisoning is an inflammation of the optic nerve, which casuese those who have it to see bright haloes around light sources. In aorder to produce the striking yellow effects in his "Sunflowers" paintins, Van Gogh used Naples yellow, a pigment containing lead. Since in his later paintings, van gogh painted bright haloes around hte stars and sun, it is likeluy that he was suffering from lead poisoning caused by ingesting the pigments he used.
which one of the following is an assumption on which the argument relies?
A.) In Van Gogh's later paintings he painted some things as he saw them.
B.) Van Gogh continued to use paints containing lead after having painted the "Sunflower" paintings.
C.) Van gogh did not have symptoms of lead posioning aside from seeing bright haloes around light sources.
D.) The paints Van Gogh used in the "Sunflowers" paintings had no toxic ingredients other than lead.
E.) The effects of Naples yellow could not have been achieved using other pigments.
I understand why the right answer is A. But I can't disprove why the correct answer also can't be D.
I felt like by assuming D, it eliminated any other alternative possibility that the OTHER element may have CAUSED Van gogh to see bright haloes. Can someone help??!!