What is the name of the index that tracks the average stock price and percentage movement of 30 leading US industrial firms?

Explanation

Option A refers to the Nikkei Index, which tracks Japanese stocks. Option B is the NASDAQ, a US stock exchange focusing on technology companies. Option C, the Dow Jones Industrial Average, measures the average price and percentage change of 30 major US industrial companies. Option D is a generic term and not a specific index.