The Beginning and Hallmark of Wisdom Is Embodied in the Statement

The beginning and hallmark of wisdom is embodied in the statement,

A) "Correlation does not imply causation" (source is controversial) .
B) "Imagination is more important than knowledge" (A. Einstein) .
C) "Nothing in life is to be feared, it is only to be understood" (M. Curie) .
D) "I don't know."
E) "If I have seen further, it is by standing on the shoulders of Giants" (I. Newton) .