The tax rate of the tribute law in Xia Dynasty, the supplementary law in Shang Dynasty and the thorough law in Western Zhou Dynasty is one tenth, that is, 10%. So, the answer is B.
/book/3/02-lib/01-ZG/03-Guo Xue/%C6% E4% CB% FB% C0% FA% CA% B7% CA% E9% BC% AE/%C0% FA% CA% B7% B9% A4. % D6 % D0 % B9 % FA % B4 % F3 % B0 % D9 % BF % C6 % C8 % AB % CA % E9 % D6 % D0 % B9 % FA % C0 % FA %