I want to know the answer to the following question:
What is the theory called dealing with the transfer of Sanskrit to India?
All the background I'm provided with is that "In order to explain the common features shared by Sanskrit and other Indo-European languages, many scholars have proposed the Indo-Aryan migration theory, asserting that the original speakers of what became Sanskrit arrived in what is now India and Pakistan from the north-west some time during the early second millennium BCE.". Is that enough to answer the question?
Answer: yes