The painting The Treason of Images asks us to consider

a) that images and words refer to things that we see but are not the things themselves.
b) that there is a direct, one-to-one relationship between objects and the words we use to name them.
c) that we are often fooled by what we see, as with trompe-l'loeil paintings.
d) that images and words not only refer to things that we see but are also the things themselves.

Answer: a