The argument that the highest correlation between personality and behavior or behavior and behavior is 0.30 to 0.40 led many psychologists to what conclusion?

Personality and behavior of an individual are correlated.

Explanation:

In the question above, the statement that the "highest correlation" between an individual's personality & behavior or behavior & behavior is 0.30 to 0.40 describes that an individual's personality and behavior are strongly correlated. The more the correlation between two different variables the more strongest bond they carries. It indicates that an individual's personality is directly proportional to his or her behavior and that they effects each other in various ways.