Correct answer: A. 1910
Explanation: The Bastar rebellion was a major tribal uprising in the Bastar region in 1910. It developed from dissatisfaction with colonial policies that affected forests, land, customary rights, and the everyday life of local communities. Restrictions on access to forest resources and interference with established practices increased resentment. Local people resisted the authority and policies of the colonial administration, making the event an important example of tribal opposition to colonial control. The year is useful for distinguishing it from other movements, since 1857 refers to the great uprising against British rule, 1930 is associated with later nationalist civil disobedience, and 1946 belongs to the final phase of the colonial period.
The question asks only for the year, so compare the four dates and recall that the Bastar rebellion occurred in 1910. Therefore option A is correct. The answer does not claim that the rebellion had only one cause; forest control and wider tribal discontent were important connected factors. The supplied answer is accurate and the brief explanation gives the appropriate historical context without confusing this event with another revolt.