What is Claudius theory about why Ophelia is acting so oddly?

In Shakespeare's "Hamlet," Claudius theorizes that Ophelia's erratic behavior is a result of her father's death and Hamlet's rejection. He believes her emotional instability stems from the overwhelming grief and distress caused by these events. Claudius expresses concern that her madness could be linked to Hamlet's actions, and he seeks to understand the implications of her condition for the royal court. Ultimately, he views her behavior as a potential threat that could further complicate the already tense situation in Denmark.