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Option 2 : Lack of artificial irrigation techniques caused crop failure in Rajasthan.
From the given statements, we can conclude that traditional ways are problematic and that dependency on rains due to lack of artificial irrigation facilities caused a drought in Rajasthan which is given in option 2. Option 1 and 3 cannot be proved right as we do not know whether pesticides and fertilizers were used or not. Option 4 and 5 also cannot be right because there is no indication given in the statements whether the department or the people prefer one way over the other. Hence, option 2 is the right answer.
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