Fill in the blanks: Category I ILS approaches have decision heights as low as ___ feet. Category II approaches have DHs as low as ___ feet. Category IIIC approaches have DHs as low as ___ feet.

Category I ILS (Instrument Landing System) approaches are typically designed to provide a minimum decision height (DH) of no lower than 200 feet above ground level. This is the lowest altitude to which a pilot can descend while still maintaining visual contact with the runway environment in order to make a landing decision.

Category II approaches can operate with a decision height as low as 100 feet. This allows for lower visibility conditions compared to Category I, providing more flexibility for pilots in certain operational scenarios.

Category III C approaches are designed for operations where aircraft can land with no decision height, meaning that pilots can continue the approach and land without needing visual references to the runway at any point prior to touchdown. This capability is enabled by advanced autopilot systems and ground-based technology that enhance safety in extremely low visibility conditions.

Thus, the correct values for the decision heights are 200 feet for Category I, 100 feet for Category II, and 0 feet for Category III C, which makes the answer fit correctly.