Final answer:
Option (a), Behavioral styles are observable tendencies that people exhibit when dealing with tasks or people.
Step-by-step explanation:
The statement that behavioral styles are observable tendencies that people exhibit when dealing with tasks or people is true. Behavioral styles refer to the consistent patterns of behavior that individuals display in different situations. These patterns can be observed and categorized based on how individuals interact with tasks or people. For example, some people may have a more task-oriented style, while others may have a more people-oriented style.