The correct answer is C. diverted.
To divert means to turn aside from a planned or intended course. In the context of air travel, a diverted flight is one that is forced to land at an airport other than its intended destination. This can happen for a variety of reasons, such as bad weather, mechanical problems, or security threats.
The other options are incorrect because they do not accurately describe the meaning of the word “diverted.” A deflected flight is one that is slightly off course, but it is still headed for its intended destination. A shifted flight is one that has been moved to a different gate or terminal at the same airport. A reverted flight is one that has been cancelled and the passengers have been rebooked on a different flight.
I hope this helps!