13. what advantage does irrigation provide during irregular rainfall?\nit only helps certain crops.\nmakes…

Brief Explanations:

Irregular rainfall creates unpredictable water availability for crops. Irrigation provides a controlled water supply, reducing reliance on inconsistent rain. The first option is incorrect as irrigation benefits most crops, not just certain ones. The third option is wrong because irrigation doesn't inherently use less water than natural rainfall. The fourth option is incorrect because irrigation can reduce but not eliminate all drought risks. Only the second option accurately describes the core advantage: stabilizing agricultural output regardless of erratic rain.

Answer:

B. Makes agriculture more dependable.