The correct answer is (b). The Green Revolution was the result of the adoption of the New Agricultural Strategy, which was introduced in the 20th century during the 1960s. The New Agricultural Strategy was a set of agricultural policies that were designed to increase crop yields and improve agricultural productivity. The policies included the use of high-yield varieties of crops, the use of fertilizers and pesticides, and the expansion of irrigation systems. The Green Revolution was a major success, and it helped to increase food production in many parts of the world. However, the Green Revolution also had some negative consequences, such as the overuse of pesticides and the depletion of groundwater resources.
The other options are incorrect. Option (a) is incorrect because the Green Revolution was not introduced in the 1950s. Option (c) is incorrect because the Green Revolution was not introduced in the 1970s. Option (d) is incorrect because the Green Revolution was not introduced in the 1980s.