What is an effect of la niña
a. fish populations off the coast of peru decrease
b. australia may have a drought
c. indonesia may have unusually high rainfall
d. alaskan dish populations decrease

C

Explanation:

La Nina is the opposite of El Nino, the temperature of the equatorial Pacific oceans waters go lower than normal (unlike in El Nino where temperature become unusually warm). La Nina causes drought condition in the western coastline of South America and wetter conditions in eastern Asia. La Nina occurs due to stronger easterlies blowing the warm ocean currents, which are responsible for rainfall,  in the equatorial Pacific towards the west causing the cooler water in the deeper oceans to upwell at the western coastline of South America.