Dinosaurs appeared during the Triassic period (225 million yrs ago) of Mesozoic era and Jurassic period (180 million yrs ago) is marked by diversification of dinosaurs, large dinosaurs dominated the earth. Permian (285-250 million yrs ago) and Devonian (395 million yrs ago) periods of Palaeozoic era occurred much before Triassic period when dinosaurs appeared. Pleistocene epoch of Cenozoic era started 2.6 million years ago and ended 0.1 million years ago.
So, the correct answer is option A.
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