How many boxes do you need if you have to pack 240 pairs ornamental bangles into boxes that each hold 2 dozens of bangles?  Select the correct option.
A) 40 B) 35 C) 20 D) 25 E) 30

Rationale: "c 20 240 pairs of bangles = 480 bangles = 40 dozens . 40 ÷ 2 = 20 boxes ."
Answer: C