Answer the questions based on the following image:

In which year did the above-indicated country end its political and economic isolation and establish diplomatic relations with the United States?

1972

The correct answer is Option (3) → 1972

The Chinese leadership took major policy decisions in the 1970s. China ended its political and economic isolation with the establishment of relations with the United States in 1972. Premier Zhou Enlai proposed the ‘four modernisations’ (agriculture, industry, science and technology and military) in 1973. By 1978, the then leader Deng Xiaoping announced the ‘open door’ policy and economic reforms in China. The policy was to generate higher productivity by investments of capital and technology from abroad.