By Itself,a Reduction in the Price of Large Tractors Imported

By itself,a reduction in the price of large tractors imported into the United States from Russia

A) decreases the GDP deflator and increases the consumer price index.
B) increases the GDP deflator but leaves the consumer price index unchanged.
C) increases both the GDP deflator and the consumer price index.
D) leaves both the GDP deflator and the consumer price index unchanged.