The temperature Saturday is -13°, and on Sunday it is -4°. Which equation would be used to show the difference in temperature from Saturday to Sunday?
A-4 + 13
B-4 - (-13)
C-4 - 13
D4 + (-13)
A-4 + 13
B-4 - (-13)
C-4 - 13
D4 + (-13)