Choose the correct options (a) Assertion(A): Many tribes obtained their livelihood from agriculture Reason(R): Many tribes used to roam around from one place to another. (1) Both A and R are true and R is the correct explanation of A. (ii) Both R and A are true but R is not the correct explanation of A. (iii) A is true but R is false. (iv) A is false but R is true. ​