The kingdom suffered a constant threat from certain predatory tribes.

The correct answer is D. plundering.

A predatory tribe is a group of people who live by attacking and stealing from other people. They are often violent and aggressive, and they will often plunder villages and towns, taking whatever they can find.

The other options are not as accurate descriptions of a predatory tribe. A wild tribe is a group of people who live in a natural environment and do not follow the rules of society. A violent tribe is a group of people who are quick to use violence to solve problems. A rebellious tribe is