Explanation:
When Ahluwalia stood on Everest, he was filled with the emotion of much humility. Let's understand why option 'D' is the correct answer.

1. Context:
The context of the question is Ahluwalia standing on Everest. This means that he has achieved something remarkable, as reaching the summit of Everest is a great feat that requires immense courage, physical strength, and mental resilience.

2. Definition of Humility:
Humility is the quality or state of being humble, which means having a modest or low view of one's importance. It is the opposite of arrogance or pride.

3. Reasoning:
When Ahluwalia stood on Everest, it is likely that he felt a sense of awe and reverence for the mountain and the challenges it presented. He may have realized the insignificance of human beings in the face of such grandeur and power.

4. Achieving a Personal Goal:
Reaching the summit of Everest is often a personal goal for mountaineers. Ahluwalia's journey to the top would have involved overcoming numerous obstacles, pushing his limits, and enduring physical and mental hardships. This achievement would have taught him the value of perseverance and determination.

5. Gratitude and Appreciation:
Standing on Everest, Ahluwalia may have felt grateful for the opportunity to witness such breathtaking beauty and experience the exhilaration of being at such a high altitude. He may have appreciated the support of his team and the natural forces that allowed him to reach the summit.

6. Acceptance of Limitations:
Being on Everest would also have made Ahluwalia realize the power and unpredictability of nature. This sense of humility arises from recognizing that human beings are small and vulnerable in comparison to the forces of nature.

Conclusion:
In conclusion, when Ahluwalia stood on Everest, he experienced a sense of much humility. This emotion arises from the recognition of the challenges overcome, the awe-inspiring nature of the mountain, and the acceptance of human limitations.