According to Research by Thibodeau, from the 1940s to the 1960s

According to research by Thibodeau, from the 1940s to the 1960s, the number of blacks depicted in stereotypic roles in New Yorker cartoons ________.

A) increased because of more prejudice in society
B) decreased, but still there was only one main black cartoon figure
C) increased, and there were 12 main black figures
D) decreased, and there were 17 main black figures