In which scenario would a "go-around" be appropriate?

A "go-around" is a critical maneuver executed during the landing phase of flight when a pilot determines that landing is not safe or feasible due to various factors. This might include adverse conditions, such as low visibility, crosswinds, or the presence of obstacles on the runway. In situations where the approach is unstable or the intended landing area is compromised, executing a go-around allows the pilot to abort the landing attempt and re-establish a safe flight path for another approach.

The other scenarios do not warrant a go-around. For instance, refueling before landing is a planned operation typically handled before a landing approach. Changing the destination mid-flight is a tactical decision made in flight but does not necessarily lead to a go-around since it pertains to altering the flight path rather than landing directly. Similarly, optimal weather conditions would generally support a safe landing approach, making a go-around unnecessary. Therefore, the scenario focusing on adverse conditions or obstacles clearly highlights the necessity for a go-around to ensure safety.