Question

No 1 language in world
a) Marathi
b)English
c)Hindi

Answer 1

mostly spoken language is ofcouse English
so on the basis of popular, English is the answer
but being Indian i would recommend Hindi

Answer 2

I think its english  with your options ...

but in whole ..

No 1 is Chinese. Numbers vary widely — Ethnologue puts the number of native speakers at almost 1.2 billion native speakers, roughly a billion of whom speak Mandarin — but there's no doubt it's the most spoken language in the world. ...  

No 2 is Spanish. ...