The correct answer is option 'A': Ring of Fire.

Explanation:
The Rim of the Pacific, also known as the Ring of Fire, is a major area in the basin of the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur. It is a direct result of plate tectonics and the movement and collisions of lithospheric plates.

Key Points:
- The Ring of Fire is a geologically active area encircling the Pacific Ocean, with a horseshoe shape. It is approximately 40,000 kilometers long and is associated with a nearly continuous series of oceanic trenches, volcanic arcs, volcanic belts, and plate movements.
- The Ring of Fire is home to about 75% of the world's active volcanoes and is responsible for about 90% of the world's earthquakes.
- It is called the Ring of Fire because it is shaped like a horseshoe or a ring, and it is marked by a series of volcanic arcs and oceanic trenches.
- The Ring of Fire is caused by the movement of several tectonic plates, including the Pacific Plate, the Nazca Plate, the Philippine Sea Plate, and the Juan de Fuca Plate. These plates are constantly moving and interacting with each other, leading to seismic activity and volcanic eruptions.
- The intense tectonic activity in the Ring of Fire is due to the subduction of oceanic lithospheric plates beneath continental plates or other oceanic plates. This subduction creates a zone of intense pressure and friction, leading to the formation of volcanic arcs and the release of seismic energy.
- The Ring of Fire is known for its high level of volcanic activity, with famous volcanoes such as Mount St. Helens in the United States, Mount Fuji in Japan, and Mount Pinatubo in the Philippines.
- It is also prone to powerful earthquakes, with major seismic events occurring frequently along the plate boundaries. The 2004 Indian Ocean earthquake and tsunami and the 2011 Tohoku earthquake and tsunami are some of the devastating earthquakes that have occurred in the Ring of Fire.
- The Ring of Fire is not only a region of natural hazards but also a source of valuable mineral resources. It is rich in mineral deposits such as gold, copper, and silver, which are formed through volcanic activity and tectonic processes.

In conclusion, the Rim of the Pacific is also called the Ring of Fire due to its horseshoe-shaped arrangement of volcanic arcs and oceanic trenches, and its association with a high level of seismic and volcanic activity.