Final answer:
The given options about the exchange between Andy Harris and Lopsang concerning delivering oxygen to other climbers do not match the known accounts of the 1996 Everest disaster, and cannot be verified as accurate.
Step-by-step explanation:
The question pertains to an event during the infamous 1996 Mount Everest disaster, which is detailed in Jon Krakauer's book Into Thin Air. Andy Harris, one of the climbing guides, realizes that climbers Rob Hall and Doug Hansen are in desperate need of oxygen and makes an offer to the Sherpa, Lopsang Jangbu, to bring oxygen cylinders to them. However, none of the options provided (a, b, c, d) accurately reflect what is described in Krakauer's account of the event, and doing research does not yield a definitive answer that matches these options. Therefore, I cannot confidently provide an answer that is factually accurate regarding the exact exchange between Harris and Lopsang.