【单选题】Which of the following would most seriously undermine the validity of the model of El Nino mentioned?
A.
During some years El Nino extends significantly farther along the coasts of Ecuador and Peru than during other years.
B.
During periods of unusually cool temperature along the eastern Pacific, an El Nino is much colder than normal.
C.
The variations in the time it takes Rossby waves to cross the Pacific depend on the power of the winds that the waves encounter.
D.
The western boundary of the Pacific basin is so irregular that it hinders most coastal Kelvin waves from heading eastward.