The Taj Mahal is taller than Mount Kilimanjaro. No anthill is as tall as Mount Kilimanjaro. Therefore, the Taj Mahal is taller than any anthill.

Mount Everest is taller than Mount Kilimanjaro. No anthill is as tall as Mount Kilimanjaro. Therefore， Mount Everest is taller than any anthill.How would you describe the above example？（ ） A: N = not an argument B: A = an argument that is neither valid nor sound C: V = an argument that is valid but not sound D: B = an argument that is both valid and sound