Khoanh vào chữ đặt trước câu trả lời đúng : 

c) Chữ số thích hợp viết vào chỗ để 18 m 2   8   d m 2   =   … . .   c m 2   :

A. 18080

B. 180800

C. 18800

D. 188000

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

______after the World War II, the United Nations has been actively carrying out its convention to stop wars and bring peace to nations worldwide.

A. Established

B. Found

C. To be establised

D. Having been found