In an Attempt to Separate the Quality Changes from Price

In an attempt to separate the quality changes from price changes of a product over time, the BLS does a:

A) hedonic quality adjustment by estimating what the price of the item would be without the improved features.
B) hedonic quality adjustment by estimating the price of similar goods.
C) qualitative price change by estimating the price of all possible brands of the items.
D) qualitative market adjustment by estimating the price of the items in all markets.