Correct answer: A. Outsider exploiters like moneylenders zamindars and officials
Explanation: The direct answer is A: Diku referred to outsider exploiters such as moneylenders, zamindars, traders, and officials. The Santhals used this word for people from outside their community whom they associated with economic exploitation, loss of land, unfair debt, rent demands, and interference in their lives. The term must be understood in the context of the Santhal rebellion, when tribal communities resisted oppressive outsiders and colonial arrangements. Option A is correct because it includes the main groups understood as Dikus. Option B, Santhal leaders, is wrong because Diku did not mean members of the Santhal community who led the rebellion. Option C, Congress workers, is wrong because the rebellion took place in the nineteenth century, before the Congress became the relevant national organisation, and the term did not mean Congress activists. Option D, English teachers, is also wrong: the word was not a general name for teachers or for every English person, but for outsider exploiters in the Santhal experience. The memory link is: Diku means the outsider who exploited tribal people. Always connect the term with land, debt, rent, and exploitation.