What was a major feature of the early Earth during the Precambrian?

The development of life forms is indeed a crucial aspect of the Precambrian era, but the correct focus on the formation of supercontinents highlights significant geological processes that shaped the Earth's crust during that time. The Precambrian spans a vast period from the formation of Earth about 4.6 billion years ago to approximately 541 million years ago, which includes critical developments such as the formation and subsequent breakup of supercontinents like Rodinia.

During this era, Earth's tectonic plates were actively moving, leading to the assembly of landmasses into supercontinents. These formations had a significant impact on the planet's climate, ocean currents, and biodiversity. The creation and breakup of supercontinents would have influenced geological activity, sea levels, and the distribution of life, providing diverse environments that eventually supported the evolution of complex organisms.

The other options, while noteworthy in their own rights, either refer to events occurring later (like human civilizations) or aspects that, although present, did not dominate the geological landscape at the scale of supercontinent formation during this vast time period.