Which would most readily induce vitamin k deficiency?

I don't think the presence of oxalic acid in food will readily induce a vitamin K deficiency because it is a fat-soluble vitamin. You have to deplete the stored vitamin K to induce the deficiency, be it by medications or removal of tissue where it is stored. Another thing is that vitamin K is not a mineral, so I don't think oxalic acid interferes with its absorption because, if I remember correctly, it works as a chelating agent for minerals like calcium and iron.