The correct answer is Option 1: agitation against the Partition of Bengal.

The `Swadeshi` and `Boycott` were adopted as methods of struggle for the first time during the agitation against the Partition of Bengal, which took place from 1905 to 1911. The Partition of Bengal was an administrative decision made by the British colonial government in India to divide the Bengal province along religious lines in 1905, with the intent of weakening the growing nationalist movement in India. The decision was met with widespread opposition from the Indian population, and it led to the adoption of the `Swadeshi` and `Boycott` movements as means of protest.

The `Swadeshi` movement called for the use of indigenous goods and products, while boycotting British goods. This movement aimed to promote self-sufficiency and self-reliance among Indians, encouraging them to use products made in India and reduce their dependence on British goods. Indians were urged to boycott British goods, including textiles, salt, and other products, as a means of economic protest against British rule.

The `Boycott` movement, on the other hand, called for a social boycott of British officials, educational institutions, and cultural events. Indians were encouraged to refrain from cooperating with British authorities and institutions, and to socially isolate British officials and their families. This movement aimed to create a sense of social and cultural isolation for the British, and to create a unified voice of protest against British rule.

The agitation against the Partition of Bengal was a significant turning point in India`s struggle for independence, as it marked the first organized effort to adopt `Swadeshi` and `Boycott` as methods of protest against British rule. It laid the groundwork for future movements, such as the Non-Cooperation Movement and the Civil Disobedience Movement, which also adopted similar methods of protest. The agitation against the Partition of Bengal was successful in bringing together various sections of Indian society, including students, intellectuals, merchants, and workers, in a unified protest against British rule and laid the foundation for the larger nationalist movement in India.

It`s worth mentioning that while the Partition of Bengal was eventually revoked in 1911 due to the strong opposition from Indians, the `Swadeshi` and `Boycott` movements had a lasting impact on India`s struggle for independence. These movements helped to instill a sense of nationalism and self-reliance among Indians, and contributed to the growth of the independence movement, ultimately leading to India gaining independence from British rule in 1947.