Answer:
definite answers:
A)The Grand Canal was constructed to unite northern and southern China.
D)The Sui dynasty reunited China in the sixth and seventh centuries by combining existing laws into a single legal code.
maybe answers:
B)The Sui united northern and southern China, but the new empire was too big to govern effectively.
Step-by-step explanation:
i know its definitely not c, due to the tang dynasty being the dynasty china entered its golden age.