Answer:
D. the people were inadequately trained on how to use the new system
Missing information:
A. the network cannot support the data transmissions
B. the software is full of errors
C. the software performs the wrong tasks
D. the people were inadequately trained on how to use the new system
E. the hardware is not functional
Explanation:
Assuming the provider of the software act in well-being and provides a functional software that will not crash every time is used (E) and (B)
The most probable reason is that people didn't understand the new interface, mechanics or features of the new system thus, performing below expected as they may though their productivity was going to increase while in fact it decrease or the daily task are now more harded to complete
