Which incident is classified as a Level B variance?

A Level B variance typically represents a situation where there is a significant deviation from standard practice that could have potential implications for patient safety or care quality, but does not result in direct harm to a patient. In this context, equipment failure with no injuries fits this classification because while the equipment failure may indicate a problem within the system that needs to be addressed, the absence of any resulting injuries suggests that the incident did not compromise patient safety at that moment.

Understanding the other options highlights why they do not fall into this category. A good patient outcome would not be classified as a variance since it indicates that care was effective, while failure to document medication and a threat to responder safety point towards serious issues that could lead to harm or legal implications, thus categorizing them as more severe incidents potentially requiring different levels of response and management.