Under the shilla dynasty , Korea became a tributary state of China. What is a tributary state ?
A. A tributary state consists of one or more villages and is located within a sovereign state.
B.A tributary state owes it allegiance to another state and adopts its laws and customs.
C.A tributary state acknowledges overlordships of another state , but preserves its independence
D.A tributary state receives tribute from another state and uses these funds to fight wars.
My answer is ...C?