We're not trying to prove that the average price went up. The argument tells us explicitly that it did. We're just trying to solve a mystery:
Why did the average price go up at the same time that people were holding off on buying houses? Answer choice A gives us a reason. Buyers of expensive houses didn't need to wait for a better financing deal, so those houses were selling as other houses were not. So we saw an increase in average prices because the high-end segment of the market was able to carry on while the lower end faltered. We don't need to know any specifics, such as whether high-end houses sold for more than usual, etc., because again we're not trying to prove anything. We just need to find something that explains the mystery, and this does it.
Yudhajit22
Can someone please explain these 2 points regarding answer option A ?
1) We dont know if the volume of High priced houses sold increased or not ?
2) We dont know if the prices of these high priced houses went up or not ?
Then how do we understand if the average went up ? (The low and moderately priced houses are still low in sales volume )