This language has the greatest number of non-native speaker in the world?

My guess is English, but the question is tricky. Non-native speakers does NOT mean every single speaker of English born outside of the UK, North America and Australia. There are many different...

I think is China and they speak Chinese More precisely Mandarin.

The language with the greatest number of native speakers in the world is Mandarin Chinese.

Mandarin Chinese. This language is spoken by the greatest number of non-English speakers. Due to a large population this why it has the greatest number of non English speakers.

The greatest language that will predominate in the United States by 2050 will be Hispanic(Latin Language).