The Swadeshi Campaign in 1896 was an important movement in the Indian independence struggle. It aimed to promote the use of Indian goods and boycott foreign goods. The correct answer in this case is option 3, which states that the campaign opposed the levy of tariff on imports. This is not correct.

Let`s look at each option to understand them better:

Option 1: Its centre was Maharashtra. This option states that the campaign was predominantly centered in Maharashtra. This is generally correct, as Maharashtra played a significant role in the Swadeshi movement. However, it is important to note that the movement had participants and supporters from various parts of India.

Option 2: Its main participants were students. This option suggests that students were the main participants in the Swadeshi Campaign. This is generally correct, as students played a vital role in promoting the use of Indian goods and boycotting foreign goods. However, it is important to note that people from different walks of life, including intellectuals, professionals, and common citizens, also participated in the movement.

Option 3: It opposed the levy of tariff on imports. This option is incorrect. The Swadeshi Campaign did not oppose the levy of tariffs on imports. Instead, it aimed to boycott foreign goods and promote