When loading bulk liquid cargo, what is the FIRST action you should take if a cargo valve jammed open?

Correct Answer: Option D — Order the dock man to shut down.

In the event of a critical failure like a jammed valve, the immediate priority is to stop the flow of product to prevent an overflow or spill. Ordering the dock man to shut down the terminal pumps is the fastest, most effective way to mitigate the risk of pollution.