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When ATC requests a report on icing conditions, the established terminology that pilots should use includes "trace," "light," "moderate," and "severe." This series of terms allows for consistent and precise communication about the severity of icing encountered.

"Trace" indicates that ice is detectable but not significant enough to require immediate attention or de-icing procedures. "Light" icing suggests that the accumulation is manageable and may be dealt with during flight on its own. "Moderate" icing indicates a more pronounced accumulation that may require the use of de-icing or anti-icing systems to maintain safe aircraft operation. "Severe" icing means that significant ice accumulation is occurring, leading to a critical situation where immediate action is necessary to ensure safety, often requiring a change in altitude or course.

Understanding these terms and correctly applying them is crucial for aviation safety and helps other pilots and air traffic controllers to assess potential hazards based on current weather conditions. The other choices do not align with the standardized reportable values used in aviation for icing conditions, making them unsuitable for this context.