Suppose that we observe two comparable properties that have each sold twice within the past two years. Property A sold 24 months ago for $575,000 and Property B sold 18 months ago for $535,000. If the two properties were sold today at $600,000 and $555,000, respectively, estimate the change in market conditions (percentage change in price) per month, assuming we equally weight the two properties in our analysis?
				A.	0.16%
				B.	0.18%
				C.	0.21%
				D.	0.19%