Article 2 of the Constitution describes the powers of the executive branch.
Answer:
....................................
Explanation:
They prevented people from leaving China because the desert were so hard to cross.(ANSWER D) Gobi desert was dangerous and dry, water available was little since oasis were rare. The Taklamakan desert has strorms with whip up frequency The day boils hot while the night freeze cold .In addition it has poisonous snake.
They were called missions.
the answer is b. good luck :))