Final answer:
Confucianism formed the basis for Korea's government during the Tang dynasty. Therefore, the correct option is A. Confucianism
Step-by-step explanation:
The Chinese philosophy that formed the basis for Korea's government during the Tang dynasty was Confucianism.
Confucianism was a philosophical system that shaped morality, governance, and social relations in China before spreading to other East Asian countries. It emphasized respect for authority, tradition, and ethical behavior.
Confucianism influenced Korea's government structure, education system, and societal norms, making it a central philosophy during the Tang dynasty.