Here's a problem to solve: The "Ring of Fire" is a long chain of volcanoes that encircles the Pacific Ocean. Which of the following is the best explanation for the arrangement of these volcanoes?

Among the 4 following options, which is the correct answer?

- A: They outline the crater caused by the impact of an asteroid.
 
- B: They follow the shape of the adjacent tectonic plates under the sea.
 
- C: One volcano usually triggers a second volcano with its hot magma.
 
- D: Volcanoes always form in rings because of underwater convection currents.
 