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

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The increase in sales from 35,000 to 40,000 units suggests an increase in demand for MP3 players. Additionally, the increase in price from $150 to $170 could also indicate an increase in demand, as consumers may have been willing to pay more for the product. The other options are less likely: A) it is not explicitly stated that supply increased, C) there is no information given about production costs, and D) there is no evidence of improved technology or other factors that would cause an upward-sloping demand curve.

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