Arrange the following in chronological order.
i. China's accession to the WTO
ii. Chinese leadership decides to end the political and economic isolation
iii. Chinese Premier Zhou Enlai proposed the 'four modernisations'
iv. China introduces the 'open door' policy

A. i, ii, iii, iv

B. ii, iii, iv, i

C. i, iv, iii, ii

D. iii, ii, i, iv

Answer: Option B