1. **Stating the problem:** We need to determine which figure is the reflection of Figure A and identify the axis of reflection. 2. **Understanding reflection:** A reflection across the x-axis changes the sign of the y-coordinates of all points in the figure, while the x-coordinates remain the same. 3. **Given information:** Figure A is a step-like polygon in the top-left quadrant (where y-values are positive), and Figure C is a matching step-like polygon in the bottom-left quadrant (where y-values are negative). 4. **Reflection check:** Since Figure C is located in the bottom-left quadrant and matches Figure A's shape but flipped vertically, it is the reflection of Figure A across the x-axis. 5. **Conclusion:** Figure C is the reflection of Figure A, and the line of reflection is the x-axis. **Final answer:** Figure C is the reflection of Figure A across the x-axis.