The answer would be C.
P waves can travel through both solid and liquids while S waves could only travel though solid.
Equator
The Equator is the invisible line that runs around the center of the Earth at 0 degrees latitude. An equator is an imaginary line around the middle of a planet or other celestial body. It is halfway between the North Pole and the South Pole, at 0 degrees latitude.
source of info: Goo_gle
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El Nino happens about every two to seven years. The closest answer here would be D., about every three to seven years
Warm hot tempatures, rainey days due to evaporation and no winter