Final answer:
The most common source of project chaos is when change turns out to be more complicated than expected.
Step-by-step explanation:
The most common source of project chaos is A. Change that turned out to be far more complicated than expected.
When a change in a project turns out to be more complicated than expected, it can disrupt the planned timeline, budget, and resources. This can lead to confusion, delays, and miscommunication among team members, resulting in chaos.
For example, if a project involves implementing a new software system, a change in requirements or unforeseen technical challenges could make the implementation process far more complex than initially anticipated, causing chaos.