What is the proper order for reporting squalls, rain, and fog?

The correct order for reporting squalls, rain, and fog is based on the hierarchy of visibility and significant weather phenomena. Rain is reported first because it usually affects visibility and is a common weather condition that pilots need to be aware of. Next, fog is mentioned because it primarily impacts visibility significantly, potentially more so than rain, but it is less intense than squalls. Finally, squalls are reported last despite being a severe weather condition, as they may occur sporadically. This order prioritizes the factors that most directly impact flight safety, starting with those affecting visibility and then addressing more dynamic weather events.

In other choices, while various weather phenomena like tornadoes and thunderstorms are included, they do not encompass the specific request regarding the sequence of squalls, rain, and fog. The focus of this question is purely on the relationship and impact of the specified weather elements on flying conditions.