Discussion
The final closure of the seaway between North and South Americas may have laid to strengthening of the Gulf stream delivering more moisture to feed snow accumulation at the northern high latitude leading to :
Answer: A
The result was the onset of an Ice Age.
The rise of the Isthmus of Panama, completed about 3 million years ago, closed the seaway between the Atlantic and the Pacific. Warm Caribbean water was then turned northward, strengthening the Gulf Stream, which carried more heat and moisture to the high northern latitudes. The extra moisture fed snowfall over North America and Scandinavia, and this is one leading explanation for the intensification of Northern Hemisphere glaciation about 2.7 million years ago, the start of the Pleistocene ice ages.
Interglacial warming, a cooling of the Pacific or a heating of the Indian Ocean are not the outcome the hypothesis describes.
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