What is your native language?

Hello!!
Today i want to introduce an experiment. The experiment is being conducted by researchers at Massachusetts Institute of Technology. Click the link , answer some questions about yourself. Then the quiz will start and ask you some questions about English. At the end of the quiz it tells you your native language and gives you 3 possibility.

I had the quiz and it gave me this order: 1. Spanish
                                                                 2.Turkish
                                                                 3.Vietnamese

What did the quiz tell you? What is your native language? Write your order of native languages!