निम्नलिखित कथनों में से कौन-सा एक, इस परिच्छेद में निहित सर्वाधिक तर्कसंगत, युक्तयुक्त और निर्णायक संदेश को सर्वोत्तम रूप में प्रतिबिंबित करता है ?

Correct Option: An enhanced efficiency of use of nitrogen is imperative for both food production and environment.

The passage discusses nitrogen use efficiency, pointing out that currently 60 percent of nitrogen added to cropland is lost to the environment, causing severe pollution (nitrous oxide emissions, ozone depletion, eutrophication) while synthetic nitrogen is essential to nourish over half the world's population for high crop yields. The central message running through the passage is that since we need high crop yields using nitrogen for food production, but excess nitrogen causes severe environmental damage, improving and enhancing the efficiency of nitrogen use is imperative for both sustaining food production and protecting the environment. Option (a) precisely captures this crucial message. Options (b), (c), and (d) suggest extreme or ungrounded policy steps not directly advocated as the central message. Thus, option (a) is correct.