Final answer:
The correct condition for the logical variable delayed to be true is delayed = notraffic * gasempty.
Step-by-step explanation:
The correct answer is (b) delayed = notraffic * gasempty.
For the logical variable delayed to be true, both notraffic and gasempty must be true. This corresponds to the logical AND operation, represented by the multiplication (*) symbol in mathematics. Therefore, the correct condition is delayed = notraffic * gasempty.