In which of the following state, the main language is Khasi?

Which of the following statements is/ are correct?

1. Konyak languages are spoken in Nagaland
2. The largest river island in the world is in Assam
3. Arunachal Pradesh has the least density of population in India
4. The largest desert in the world is situated in India

Choose the correct option from the codes given below:

[A] 1 & 2
[B] 1, 2 & 3
[C] 1, 2 & 4
[D] 1, 2, 3 & 4

which of the following statements about the phosphorus cycle is true?