Suppose in 2009, the United States Imported $1

Suppose in 2009, the United States imported $1.5 billion worth of goods and services and sold $4 billion worth of goods and services outside its borders. Therefore, in 2009 net exports were:

A) −$4.4 billion
B) $4.4 billion​
C) $2.5 billion
D) −$2.5 billion
E) $5.5 billion