Final answer:
Jealousy, controlling, deflecting, and isolation are all signs of toxic behavior, which is indicated by answer C. Maintaining healthy relationships involves avoiding these toxic traits and seeking independence and balance, especially with mobile communication as mentioned by Hall (2012).
Step-by-step explanation:
The signs that are mentioned in the question, such as jealousy, controlling, deflecting, and isolation, are indicative of toxic behavior. Therefore, the correct answer is C) Toxic behavior. These signs are harmful to the well-being of individuals in any relationship, be it romantic, friendship, or family. A healthy relationship should instead be based on trust, mutual respect, open communication, and support.
Over-reliance on mobile devices in friendships can lead to similar toxic dynamics. As asserted by Hall (2012), friendships heavily dependent on such communication technology may experience overdependence issues, including elements of guilt and feeling entrapped to respond, causing dissatisfaction within the relationship. This underscores the importance of fostering relationships that allow for independence and do not create undue pressure to maintain constant communication.