Suppose the Growth Rate of GDP in the United States

Suppose the growth rate of GDP in the United States is 4.2 percent. If 2.9 percent and 1.3 percent of GDP growth are due, respectively, to capital and labor growth, the amount resulting from technological progress is

A) 0 percent.
B) 1.3 percent.
C) 2.9 percent.
D) 4.2 percent.