Explanation:

- Assertion (A): The concern for future generations can make development last forever.

- This statement is true because sustainability aims to ensure that resources and opportunities are available for future generations, thus giving development an enduring nature.

- Reason (R): Meeting the needs of all under sustainable development requires redistribution of resources.

- This statement is also true as sustainable development often involves equitable distribution to ensure everyone's needs are met.

- Option 1: Both assertion and reason are true. Reason is the correct explanation of assertion.

- This is not correct. While both statements are true, the reason does not directly explain how future-centric development lasts forever.

- Option 2: Both assertion and reason are true. Reason is not the correct explanation of assertion.

- This is the correct choice. The truth of each statement stands independently. The reason given does not directly explain the assertion.

- Option 3: Assertion is true but reason is not.

- This is not correct. Both statements are true.

- Option 4: Reason is true but assertion is not.

- This is not correct. Both statements are true.