The DEBTLAND's debt-GDP ratio in 2004 was 0.7, but it went down by 20 percent in 2005. If the interest rate paid on debt is 4 percent and the economy grows by 4 percent in 2005, the DEBTLAND's primary deficit to GDP ratio must

A) have increased by 20 percent.

B) have decreased by 20 percent.

C) have remained unchanged.

D) have decreased by 4 percent.