Assertion (A): For successful language-learning experience the learner is exposed to an adequate amount of the data of the language. Reason (R): The reference to 'adequate data' suggests that a single textbook presented over a year to teach students is inadequate.

1. A is true; R is not true.
2. Both A and R are true and R is the correct explanation of A.
3. Both A and R are true and R is not the correct explanation of A.
4. A is not true but R is true.