According to the Textbook, as a Practical Matter If Mortgage

According to the textbook, as a practical matter if mortgage market interest rates have dropped at least ____ full percentage points since the borrower took out his or her first mortgage loan and the borrower plans to remain in the home normally about ____ to ____ years then refinancing through a cheaper new loan is usually an attractive move.

A) Three, one, two
B) Two, one, three
C) Two, two, three
D) Four, three, four
E) None of the above