Final answer:
When Rob Hall, Andy Harris, and Mike Groom were unable to lead, Stuart Hutchinson assumed leadership of the Everest expedition.
Step-by-step explanation:
The question relates to the tragic events surrounding the 1996 Mount Everest disaster, a seminal event in mountaineering history. After Rob Hall and Andy Harris passed away, and Mike Groom became incapacitated, Stuart Hutchinson was the person who took the lead in the Everest expedition amongst the surviving climbers. This was a dire situation where a change in leadership was critical for the surviving members. Although Beck Weathers and Yasuko Namba were part of the expedition, they were both clients and not in a position to take over leadership responsibilities. Doug Hansen was also a client and undergoing distress during the descent which ruled him out as well.