What would happen if the difference in pressure in Tahiti was negative?

Correct option is C

The correct answer is (c) Below average and late monsoon.
 The difference in atmospheric pressure between Tahiti and Darwin, Australia, is a key indicator of the Southern Oscillation, which is closely linked to the El Niño and La Niña phenomena.
 A negative pressure difference in Tahiti typically indicates an El Niño event.
 El Niño is associated with the warming of the central and eastern tropical Pacific Ocean, which disrupts normal weather patterns.
 In India, El Niño often leads to a weaker and delayed monsoon season, resulting in below-average rainfall and a later-than-normal onset of the monsoon.
Information Booster:
Southern Oscillation Index (SOI):
 The SOI measures the difference in air pressure between Tahiti and Darwin.
 A negative SOI value indicates lower pressure in Tahiti compared to Darwin, signaling an El Niño event.
 A positive SOI value indicates higher pressure in Tahiti, signaling a La Niña event, which generally results in stronger monsoons in India.
El Niño Effects:
 Reduced rainfall and increased likelihood of drought conditions in India.
 Warmer than usual temperatures in the central and eastern Pacific Ocean.
 Disruption of marine ecosystems and fisheries due to altered ocean temperatures.