Which method of establishing probability is most open to bias?

A) They are all equally open to bias.
B) intuitive judgment
C) method of frequency
D) method of equal alternatives
E) None of them is open to bias.

Intuitive judgment relies solely on the individual's personal opinion and perception, which is highly subjective and prone to biases. Other methods, such as frequency and equal alternatives, provide more objective and quantitative data to calculate probability.