The compound ratio of 1:3, 3:2 and 4:5?	Select.
A) 1 : 9	B) 1 : 7	C) 1 : 2	D) 2 : 5	E) 1 : 4

Rationale: "1 / 3 * 3 / 2 * 4 / 5 = 2 / 5 = 2 : 5 answer : d"
Answer: D