(in fictional writing) the narrator's position in relation to a story being told.
"this story is told from a child's point of view"
the position from which something or someone is observed.
"certain aspects are not visible from a single point of view"
In my opinion, out of the sentences offered here the one which best
shows how Dr Heidegger's character represents wisdom is D - 'If the
fountain gushed at my very doorstep, I would not stoop to bathe my lips I
it; no, though its delirium were for years instead of moments.' Here Dr
Heidegger is discussing the fountain of youth and how, although he can
admit he is tempted by it, he would be able to resist due to his wisdom
and powers of reasoning.