Jordan has a jar of marbles with 2 red marbles, 8 blue marbles, 2 green marbles, and 1 yellow marble. What could the ratio of 1/2 represent?
 A) Yellow marbles: red marbles
 B) Yellow marbles : Green marbles
 C) Green marbles : blue marbles 
 D) Green marbles: yellow marbles
 E) Blue marbles: total marbles
 F) Green and red marbles: blue marbles