Explanation:

3rd statement is incorrect i.e. The cultivators of Champaran had protested against excessive taxation on sugar.
Champaran, is a district in the state of Bihar. Under Colonial era laws, many tenant farmers were forced to grow some indigo on a portion of their land as a condition of their tenancy. This indigo was used to make a dye. The Germans had invented a cheaper artificial dye so the demand for indigo fell. Some tenants paid more rent in return for being let off having to grow indigo. However, during the First World War the German dye ceased to be available and so indigo became profitable again. Thus many tenants were once again forced to grow it on a portion of their land- as was required by their lease. Naturally, this created much anger and resentment.
Many tenants alleged that Landlords had used strong-arm tactics to exact illegal cesses and to extort them in other ways. This issue had been highlighted by a number of lawyer/politicians and there had also been a Commission of Inquiry. Raj Kumar Shukla, a money lender who also owned some land, persuaded Gandhi to go to Champaran and thus, the Champaran Satyagraha began.