Which of the Following Statements Is in the Realm of Positive

Which of the following statements is in the realm of positive economics?

A) The president should propose a tax cut because taxes are too high.
B) Studies show that if taxes are cut,unemployment falls.
C) The budget deficit is too high and should be lowered.
D) Studies show that a national debt of over a trillion dollars is bad for the country and should not be allowed to occur.
E) The share of defense spending in the budget ought to be changed.