At the End of the Cretaceous (K/T Boundary)what Unusual Geologic

At the end of the Cretaceous (K/T boundary) what unusual geologic phenomenon occurred that has been linked to mass extinction and the end of the dinosaurs?

A) A 10 kilometre diameter meteor impact occurred on the Yucatan peninsula.
B) Enormous outpourings of basaltic lavas built the Rocky Mountains in British Columbia.
C) The climate abruptly warmed and massive weathering of iridium poisoned the seas
D) Dinosaurs were hunted to extinction by Klingons.

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