One of the Common Themes Resulting from Research into the Common

One of the common themes resulting from research into the common attributes shared by successful entrepreneurs is that:

A) Those attributes can be learned.
B) Those attributes cannot be learned, an individual is either born with them or they are not.
C) Those attributes are always the same - confidence, determination, and perseverance are always at the top of the list.
D) There are no "common" set of attributes - each entrepreneurial success story is unique.