The correct answer is A) 2x+5.
Completing the synthetic division, first bring down the leading coefficient:
-1| 2 7 5
2
Now multiply this by the divisor, -1, and write it under the 7:
-1| 2 7 5
-2
2
Now add the two values in the middle, 7 and -2:
-1| 2 7 5
-2
2 5
Multiply the 5 by the -1:
-1| 2 7 5
-2 -5
2 5
Add the 5 and -5:
-1| 2 7 5
-2 -5
2 5 0
This corresponds with an answer of 2x+5 and remainder of 0.