Many Researchers Believe That Mental Images, While Not Literally Pictures

Many researchers believe that mental images, while not literally pictures in the mind, function in ways analogous to actual visual images. How does the research by Shepard and Metzler on mental rotation apply to this idea?

A) Their findings are inconclusive and neither support nor refute the idea
B) Their findings indicate that mental images might operate like pictures
C) Their research cannot address this idea.
D) Their findings indicate that mental images are not like pictures