In 2007 a Company Sold 35,000 MP3 Players at $150

In 2007 a company sold 35,000 MP3 players at $150 each.In 2008 the same company sold 40,000 MP3 players at $170 each.This information suggests that

A) The supply of MP3 players increased from 2007 to 2008.
B) The demand for MP3 players increased from 2007 to 2008.
C) The price of MP3 players increased because the costs of production increased from 2007 to 2008.
D) From 2007 to 2008,the demand curve for MP3 players was upward-sloping because of improved technology.