Final answer:
The term for the warm water flow disrupting weather patterns is El Niño, a phase of the ENSO climatic cycle that causes significant changes in global weather and can lead to extreme conditions.
Step-by-step explanation:
The term you are looking for that describes an irregularly recurring flow of unusually warm waters from the Pacific Ocean toward the western coast of South America, which disrupts cold deep water and weather patterns, is B) El Niño.
El Niño is a part of a larger climatic cycle known as El Niño Southern Oscillation (ENSO), which includes the complementary cool phase known as La Niña. El Niño events change global weather patterns and can lead to extreme weather conditions in various parts of the world. The counterpart, La Niña, represents periods when the sea surface temperatures in the eastern Pacific Ocean are lower than average and also has significant impacts on global weather patterns.
It's worth noting that other terms listed, such as tsunami, volcanoes, and floods, describe different types of natural events or phenomena.