What is the possible reason for the decline in the population of the Ganges river dolphin other than hunting- theft? 1. Dam on rivers and construction of barges 2. Increase in population of crocodiles in rivers. 3. Accidentally getting caught in fishing nets.4. Use of synthetic fertilizers and other agrochemicals in crop-fields adjacent to rivers Select the correct answer using the code given below :

• A. 1,2,3और 4
• B. 1,3 और 4
• C. केवल 2 और 3
• D. केवल 1 और 2