Which phrase describes the inability to complete a task regarding the fire?

The phrase "Been unable to" clearly conveys the concept of not having the capability or means to complete a task concerning the fire. It directly indicates a lack of ability or success in achieving the desired outcome, which aligns perfectly with the idea of inability. This phrase succinctly captures the essence of not being able to do something, highlighting a straightforward acknowledgment of failure or hindrance in completing a specific task.

The other phrases suggest different meanings or contexts. For instance, "Successfully managed" implies that the task was completed effectively, which is the opposite of being unable to finish. "Well-handled by" also suggests that the task was dealt with competently, again contradicting the idea of inability. "Could have done" implies potential or possibility but does not indicate whether the task was actually completed or not; it focuses on the hypothetical aspect rather than actual inability.