Caterpillar's Sales Were Severely Affected by the Decline in the U.S.housing

Caterpillar's sales were severely affected by the decline in the U.S.housing market that began in 2006.Sales in the United States declined by ________ between 2006 and 2008,and export sales ________ during the same time period.

A) more than half; increased by enough to make 2008 a record sales year
B) almost 90 percent; remained virtually unchanged
C) almost 90 percent; declined by half
D) more than half; declined by a similar percentage