A Researcher Looked at How Aesthetic Ratings Were Affected by Beliefs

A researcher looked at how aesthetic ratings were affected by beliefs about a painting's attributes. One group of art historians were shown three paintings, and told that the first was by Picasso, the second by Rembrandt and the third by Monet. Another group were shown the same paintings, but told they were by amateur artists. Each art historian was then asked to independently rate each painting for its aesthetic impact. This is an example of a:

A) matched pairs design, with two independent variables: the fame of the painter and the aesthetic impact of the painting.
B) mixed design, with two independent variables: the apparent fame of the painter, and the type of painting.
C) mixed design, with two independent variables: the type of painting, and its rated aesthetic impact.
D) an independent-measures design, with one independent variable: the type of painting.