A Meteorologist Is Examining National Temperature and Precipitation Records and Notes

A meteorologist is examining national temperature and precipitation records and notes that recent months have been unusually hot and dry, particularly in the eastern parts of Australia. The meteorologist hypothesises that this could be due to an El Niño event. How could the meteorologist confirm this?

A) Check ocean currents for evidence of stability in the Southern Oscillation which leads to El Niño conditions.
B) Check records to see if there was a La Niña event in southern America in the preceding 5 years. If so, it is highly likely an El Niño event will occur in Australia due to the 5-year cyclical pattern of such events.
C) Examine air temperature data for the eastern equatorial pacific and see if there is a low temperature zone present.
D) Examine air pressure data for the eastern equatorial pacific and see if there is a high pressure zone present.
E) Examine air pressure data for the eastern equatorial pacific and see if there is a low pressure zone present.