The answer would be B. 4m - 24n + 3.
To solve this, you line up each integer under the proper area. Simply move the positive 4 to the end of the bottom polynomial. Then solve.
17m - 13m = 4m
-12n - 12n = -24n
-1 + 4 = 3
Thus giving you an answer of 4m - 24n + 3 or B.
I hope this helps!
