After Vietnam Joined the World Trade Organization in 2007, Both

After Vietnam joined the World Trade Organization in 2007, both the country's imports and exports increased significantly. Based on this scenario, which of the following would have occurred in the market for the Vietnamese dong?
(i) an increase in the demand for the Vietnamese dong
(ii) a decrease in the demand for the Vietnamese dong
(iii) an increase in the supply of the Vietnamese dong
(iv) a decrease in the supply of the Vietnamese dong

A) (i) , (ii) , (iii) , and (iv)
B) (ii) and (iv)
C) (i) and (iv)
D) (i) and (iii)