What is the language with the most native speakers?

Mandarin Mandarin, a Chinese language, is a first language spoken by 935 million people. BASICALLY if this is a homework question them its Mandarin

Mandarin (and it's not an estimate. It's a fact).

the country with the highest population, naturally, so china

Mandarin, Spanish, and English (in that order).

English with 2 billion speakers it doubles the next highest, Mandarin, with 900million speakers.