Solution:Penck and Bruckner identified the glacial stages in the Alpine region, notably naming the Gunz and Wurm stages. These stages represent different periods of glaciation during the Pleistocene epoch.The Gunz glaciation is one of the earliest glaciations, while the Wurm glaciation is one of the last major glaciations before the current Holocene epoch. The Weichsel glaciation refers to the last glacial period in northern Europe, and the Holstein interglacial is a warm period between glaciations. Hence, the correct answer is Gunz and Wurm stages only, making options A and D incorrect.