Answer : 3. "ओटावा समझोता "
Explanation :

The policy of imperial preferences adopted by Britain in its colonies in 1932 is also known as the Ottawa Agreement. This agreement was a series of bilateral trade agreements between the United Kingdom and various members of the British Empire, including Canada, Australia, South Africa, and New Zealand. The agreements aimed to promote trade within the British Empire by providing preferential treatment to goods from member countries.