The correct answer is (a). The Forest Research Institute was established in 1896 in Dehradun, India. It is the oldest forestry research institute in the world. The institute was established by the British government to conduct research on forestry and to train forest officers. The institute has played a major role in the development of forestry in India. It has developed new technologies and practices for forestry, and it has trained thousands of forest officers. The institute is now a leading center for forestry research and education in the world.
Option (b) is incorrect because the Forest Research Institute was established in 1896, not 1906.
Option (c) is incorrect because the Forest Research Institute was established in 1896, not 1910.
Option (d) is incorrect because the Forest Research Institute was established in 1896, not 1950.