Please help :D How did the Tang people gain the Mandate of Heaven?

A. Song rulers grew weak and quarreled among themselves.
B. Arab traders took over the Silk Road trade, which undermined the Tang economy.
C. Tang invaders from the far north overthrew the Sui dynasty.
D. A Sui official led a rebellion that caused the Sui dynasty to collapse.
Thx so much if u could :)

freedom of speech is also protected by the 1 amendment.

explanation:

here is pretty much what the 1st amendment says:

congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.

answer by yourhope:

the speaker of which statement would be best served by joining an interest group?

i want politicians to make more of an effort for lgbt rights!

: )