Which feature is primarily responsible for the stalactites' formation in caves?

Stalactites form primarily due to water dripping from the ceilings of caves. This process begins when rainwater, which absorbs carbon dioxide from the atmosphere and soil, becomes slightly acidic and seeps into the ground. As this water enters a cave, it continues to dissolve calcium carbonate from the limestone rock formations. When this mineral-rich water drips from the cave ceiling, it leaves behind small deposits of calcium carbonate as it evaporates. Over time, these deposits accumulate, creating the iconic icicle-shaped stalactites that hang from the cave ceiling. The other options, such as mineral deposits from flowing rivers, do not relate to the specific process of stalactite formation within caves. Wind erosion and human exploration also do not contribute to the development of stalactites, making the process that involves dripping water the main catalyst for their formation.