According to Chapter 15, Which Statement or Statements Below Is/are

According to Chapter 15, which statement or statements below is/are true.

A) Decisions by default are never used in any area of clinical care.
B) Public health professionals have now shifted from a more dominant style of generating behavioral change to a more subtle one through alternative forms of "nudging" individuals to change.
C) Some public health researchers have argued that behavior change is more effective through nudging than through legislated change.
D) a and b
E) b and c
F) a, b, and c
G) Neither a, b, nor c