Identify and explain the concepts from the given illustrations:
Assertion (A) – Agricultural productivity is affected by climatic changes.
Reasoning (R) – To increase agricultural activity, the development of irrigation facilities is necessary.
(i) (A) is true but (R) is False.
(ii) (A) is false, but (R) is True.
(iii) Both (A) and (R) are true and (R) is the correct explanation of (A).
(iv) Both (A) and (R) are True, but (R) is not the correct explanation of (A).