Subject: mathqa
Question: the price of commodity x increases by 30 cents every year , while the price of commodity y increases by 20 cents every year . if in 2001 , the price of commodity x was $ 4.20 and the price of commodity y was $ 4.40 , in which year will commodity x cost 80 cents more than the commodity y ?
Option: 
A: 2014 .
B: 2011 .
C: 2010 .
D: 2013 .
Answer: B