Final answer:
Assertiveness involves direct, honest communication while respecting others, which is contrary to the illegal and aggressive nature of blackmailing. The statement in question is false. The correct option is B.
Step-by-step explanation:
The statement that extreme forms of assertiveness include blackmailing colleagues is false. Assertiveness is a communication style in which a person stands up for their own rights and desires while also respecting the rights of others.
Blackmail, on the other hand, is an illegal activity that involves threats to force someone to do something against their will and is not a form of assertive behavior. Assertiveness is about being direct and honest while maintaining respectful interactions; hence, blackmailing is not categorized under assertive behavior but under aggressive or criminal behavior.