Rakekniven Peak is a peak, 2,365 m, at the north end of Trollslottet Mountain in the Filchner Mountains, Queen Maud Land. The peak was plotted from surveys and air photos by Norwegian Antarctic Expedition (1900–60) and named Rakekniven (the razor) after its distinctive shape. It is an almost vertical granite spur protruding from the mountains, and was climbed by Alex Lowe in 1996.

Based on that paragraph can we conclude that this sentence is true?
The Filchner Mountains are mostly granite.

Options are: A). Yes; B). It's impossible to say; C). No;
B).