Correct option is C
According to Buddhism, linguistic communication is indeed encouraged to adopt a moral stance. This is aligned with the Buddhist precept of Right Speech, which is part of the Noble Eightfold Path. Right Speech encourages speaking truthfully, avoiding slander, gossip, and harmful speech, and thus plays a critical role in adopting and promoting a moral stance in life. Therefore, Statement I is correct.
On the other hand, Statement II is incorrect. Buddhism places a significant emphasis on critical introspection as part of intra-personal communication. Mindfulness and meditation are core practices in Buddhism, encouraging individuals to observe their thoughts and emotions critically without attachment. This introspection is vital for understanding the nature of the self, achieving personal growth, and attaining enlightenment. Hence, critical introspection is not only preferred but essential in Buddhist practice.