Which famous experiment did Neil Armstrong conduct while on the moon?

Neil Armstrong's time on the Moon during the Apollo 11 mission involved a variety of important tasks that each contributed to the overall goals of the mission. The correct answer encompasses all the activities associated with his lunar exploration.

During the mission, Armstrong, along with Buzz Aldrin, performed a historic moonwalk, where they conducted experiments and collected samples. One of the iconic moments of this lunar walk was their planting of the American flag, symbolizing the success of the mission and the achievement of landing humans on the Moon for the first time. Additionally, Armstrong took soil samples from the lunar surface, which were crucial for scientific analysis and understanding the composition of the Moon.

Thus, option D accurately captures the comprehensive scope of Armstrong's activities while on the Moon, making it the most complete and correct answer. This consolidation of diverse tasks illustrates the significance of the Apollo 11 mission in advancing space exploration and scientific knowledge.