The WTO Agreement on Agriculture Distinguishes the Greater or Less

The WTO Agreement on Agriculture distinguishes the greater or less market distorion of farm polices by using a colored-box traffic-light analogy. For example,

A) a ""red box"" policy is considered to have the least amount of market distorting impacts.
B) an ""amber box"" policy is considered to have the most harmful amount of market distorting impacts.
C) a ""black box"" policy is considered to have an unknown amount of market distorting impacts.
D) a ""yellow box"" policy is considered to have the least amount of market distorting impacts.
E) a ""violet box"" policy is considered to have a median or average amount of market distorting impacts.