Which of the Following Is NOT a True Statement Regarding

Which of the following is NOT a true statement regarding the collapse of the Tang dynasty?

A) Trade came to a virtual standstill with the collapse of the Tang dynasty.
B) The equal-field system, instituted by the Tang, fell apart due to the government's inability to manage it properly.
C) The Tang lost much-needed revenue from Buddhist estates that were not required to pay taxes.
D) The Tang faced continual threats from various clans in Inner Eurasia.