An Art Collector Recently Sold a Piece of Pottery for $300

An art collector recently sold a piece of pottery for $300. He had purchased it for $200 two years earlier. How will the most recent sale affect GDP?

A) GDP will increase by $100.
B) GDP is unaffected.
C) GDP will increase by $300.
D) GDP will increase by $200.
E) GDP 2 years ago must be adjusted downwards by $200, and current GDP will rise by $300.