Answer:
angle ABC (answer B)
Explanation:
To determine the label for an angle, the middle point in the angle (where the angle is) is going to be in the middle of the label. The two letters on either side are determined based on what sides you use for the angle. Notice on the problem the angle is using the lines with points A and C, whereas the one with D isn't used. Now there are actually two right answers here, you can either label it angle ABC or angle CBA. B stays in the same position no matter what, because that where the angle is- in between A and C. But you can rearrange the order of the sides to go AC or CA, because either way it's the same angle.
So based on that, answer B would be correct
I hope this helps :)