Read the following context and choose the best option to answer the question.
Context: As each item came out of the container , it was checked off on my inventory sheet and moved to the next station where a second team of Soldiers brought the stuff inside . Everyone worked really hard and followed my directions and we had all 3 containers emptied in an hour ! That was about 2 - 3 hours shorter than some people were thinking it would take . Then at 1500 I headed up to the Battalion area with 2 Soldiers and we went and got the tuff boxes and duffel bags of the Soldiers who got to the unit too late to ship their stuff in the first shipment .
Question: What may be the reason that the work took less time than expected ?
Options: 
A. There was less work on the inventory sheet
B. None of the above choices .
C. They received a smaller shipment than expected
D. Everyone worked really hard


D