According to researchers, how is a La Niña event triggered?

The answer is 'B'

Explanation:

Warm air toward high latitudes and cool air toward the equator.

Often, El Niño is accompanied by La Niña, as if warm seawater is bubbling back and forth across the Pacific Ocean. The development of El Niño is associated with trade winds. Appears when they are weaker than usual, and La Niña occurs when they are stronger than usual.

format change of dna.