"there is a massive upwelling along the coast of south america which makes the surface waters over eastern tropical pacific unusually cold." which of these events is described by the statement? el nino la nina land breeze sea breeze

The event described in the statement is La Niña.

Explanation:

Both El Niño and La Niña are the most obvious examples of global climate change, being a fundamental part of a vast and complex system of climatic fluctuations. El Niño is known as the warm period and La Niña as the cold period. La Niña is characterized by having cold and lasting temperatures, compared to El Niño, since it is characterized by unusually hot ocean temperatures over the equatorial Pacific Ocean.

Episodes of La Niña, like the El Niño phenomenon, produce large-scale changes in atmospheric winds over the Pacific Ocean, including an increase in the intensity of the East (East-West) trade winds in the lower atmosphere on the eastern part of the Pacific Ocean in South America, and the west winds in the upper atmosphere.

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.