Many of the research findings in support of Freud's theory of humor can also be explained by the fact that people find ____________funny.

A) incongruity
B) all forms of humor
C) what others laugh at to be
D) what society tells them to laugh at to be

Incongruity is a common element of humor, where unexpected or contrasting elements are combined in a way that creates a sense of surprise or amusement. While Freud's theory focuses on the psychological motives behind this appreciation of incongruity, it can also be simply explained by the fact that people find it funny. Therefore, option A is the best choice. The other options, B, C, and D, are either too general (all forms of humor) or do not provide a clear explanation (what others laugh at to be, what society tells them to laugh at to be).