The correct answer is option 'C', the United States of America. The MQ-9B Predator Drone is developed by General Atomics Aeronautical Systems, which is an American aerospace and defense manufacturer. Let's delve into the details of this answer.

The MQ-9B Predator Drone and its Development:
The MQ-9B Predator Drone is an unmanned aerial vehicle (UAV) or drone that is primarily used for intelligence, surveillance, and reconnaissance (ISR), as well as for strike missions. It is an upgraded version of the original MQ-1 Predator Drone.

General Atomics Aeronautical Systems:
General Atomics Aeronautical Systems (GA-ASI) is an American company that specializes in the design, development, and manufacture of UAVs, radar systems, and other defense technologies. It is a leading producer of remotely piloted aircraft systems (RPAS) and has been at the forefront of drone technology for several decades.

Key Features of the MQ-9B Predator Drone:
1. Endurance: The MQ-9B Predator Drone is capable of long-endurance flights, lasting up to 40 hours, allowing it to operate for extended periods over a target area.
2. Payload Capacity: It has a significant payload capacity, enabling it to carry a variety of sensors, cameras, and weapons.
3. Surveillance Capabilities: The drone is equipped with advanced sensors and cameras, including synthetic aperture radar (SAR), infrared sensors, and high-resolution cameras, providing it with exceptional surveillance capabilities.
4. Weapons Integration: The MQ-9B Predator Drone can be armed with precision-guided munitions, making it capable of conducting targeted strikes against enemy targets.
5. Communication and Connectivity: It has advanced communication systems, allowing for real-time data transmission and connectivity with ground control stations.

Applications and Significance:
The MQ-9B Predator Drone has proven to be a valuable asset for various military operations and missions. Its advanced surveillance capabilities make it ideal for intelligence gathering, target identification, and reconnaissance. Additionally, its long-endurance and weapons integration capabilities make it a formidable tool for conducting precision strikes and supporting ground forces.

Conclusion:
The MQ-9B Predator Drone is developed by General Atomics Aeronautical Systems, an American defense manufacturer. Its advanced features, endurance, and weaponry make it a crucial asset for intelligence, surveillance, and reconnaissance missions, as well as for conducting targeted strikes.