CR3

One of the effects of lead poisoning is an
inflammation of the optic nerve, which causes those
who have it to see bright haloes around light sources.
In order to produce the striking yellow effects in his
"Sunflowers" paintings, Van Gogh used Naples
yellow, a pigment containing lead. Since in his later
paintings, Van Gogh painted bright haloes around
the stars and sun, it is likely 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 "Sunflowers"
paintings.
(c) Van Gogh did not have symptoms of lead
poisoning 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.