Which of these would make the best topic sentence for paragraph 4?
A.
The U.S. enacted an Executive Order called the Clean Diamond Trade Act (CDTA) to implement the KPCS.
B.
The Kimberly Process Certification Scheme was started to verify that diamonds were from conflict free zones.
C.
"Blood diamonds" are also referred to as "hot diamonds," "war diamonds" and "converted diamonds."
D.
The World Diamond Council says "conflict diamonds" account for less than 1% of all diamond sales now.