Passage: Read the given passage and answer the questions that follow. In the year 2075, humanity had successfully established a thriving colony on the Moon. Luna City, as it was named, became home to over 10,000 inhabitants. People from all over Earth migrated to the Moon, driven by the promise of new opportunities and the excitement of living in a low-gravity environment. Luna City was a marvel of modern engineering, featuring sprawling biodomes that contained lush gardens and artificial lakes, ensuring residents had access to fresh air and water. Solar panels spread across the Moon's surface provided ample energy, harnessing the sun's power to sustain the city's needs. Underground tunnels connected various sectors of the city, housing residential areas, research facilities, and recreational spaces. One of the most intriguing aspects of life on the Moon was the adaptation required to thrive in a low-gravity environment. Children born on the Moon grew taller and leaner than their Earth counterparts, and their bones and muscles developed differently. Sports had evolved to fit this new reality, with lunar basketball and low-gravity gymnastics becoming popular pastimes. Elena, a 16-year-old girl who had lived on the Moon since she was five, loved her life in Luna City. Her parents, both scientists, worked on developing sustainable agricultural practices that could be used on other celestial bodies. Elena attended the Luna Academy, where she excelled in astrophysics and robotics. Her dream was to become an astronaut and explore the far reaches of space. Despite the wonders of lunar life, there were challenges too. The lack of natural weather meant that residents never experienced rain or wind, and the monotony of the artificial environment sometimes felt stifling. Additionally, the distance from Earth led to feelings of isolation, as real-time communication with loved ones back home was impossible due to the delay. To mitigate these issues, the Luna City Council organised frequent virtual reality (VR) trips to Earth, allowing residents to experience Earth’s natural landscapes and climates. These VR experiences became a favourite pastime, providing a much-needed escape from the stark lunar environment. Life on the Moon, while challenging, represented humanity's indomitable spirit and desire to explore and adapt. Elena and her fellow Luna City residents embodied this spirit, living proof that humans could thrive even in the most unlikely places. Question: What is the structure of the passage?

1. Cause and effect
2. Narrative storytelling
3. Compare and contrast
4. Problem-solution