The correct answer is - Large numbers of migratory birds;
The number of the migratory birds has always been pretty high and it hadn't resulted in the drying up of the Ogallala Aquifer, not to mention that those birds can not even reach that water because it is underground. Also, the number of the migratory birds have been steadily lowering, so even if they were using that water for drinking, it wouldn't have caused the drying out.
The Ogallala Aquifer has started to dry out because of numerous reasons, with the usage of its water for irrigation being the prime reason. The droughts have become longer, and the temperatures little higher, while the rainfall slightly smaller, so all of that affected the reserves of water in the aquifer negatively.
Indians used violent as well as peaceful means of agitation against the British rulers. The Congress Party was the largest anti-British organization. Led by Gandhi ji, it used non-violence and satyagraha to press its demands for independence.
Not all the Indians believed in peaceful means, though. The Indian National Army was a military organization that actively fought against the British forces during the Second World War.
There were a lot of revolutionaries also who used bombs and weapons against the British. Some of them were grouped under the Hindustan Republican Army.
A text that fits this criteria would be a "secondary source" since it is compiled by primary sources (which are used as direct evidence). Although certain secondary sources are reliable in other ways.
