4 Answers

Pos Language Family Script(s) Used Speakers
(Millions) Where Spoken (Major)
1 Mandarin Sino-Tibetan Chinese Characters 1151 China, Malaysia, Taiwan
2 English Indo-European Latin 1000 USA, UK, Australia, Canada, New Zealand
3 Spanish Indo-European Latin 500 Mexico, Central and South America, Spain
4 Hindi Indo-European Devanagari 490 North and Central India
5 Russian Indo-European Cyrillic 277 Russia, Central Asia
6 Arabic Afro-Asiatic Arabic 255 Middle East, Arabia, North Africa
7 Portuguese Indo-European Latin 240 Brazil, Portugal, Southern Africa
8 Bengali Indo-European Bengali 215 Bangladesh, Eastern India
9 French Indo-European Latin 200 France, Canada, West Africa, Central Africa
10 Malay, Indonesian Malayo-Polynesian Latin 175 Indonesia, Malaysia, Singapore

I haven't researched but it would have to be Cantonese.

Mandarin is spoken by the largest population. English is the official language in the most countries but comes in second by population.

Im not sure but i would say it is english