The gold numbers of protective colloids $A, B, C$,and $D$ are $0.04, 0.004, 10$,and $40$ respectively. The order of their protective power is:

• A
  $A > B > C > D$
• B
  $B > A > C > D$
• C
  $D > C > A > B$
• D
  $D > C > B > A$