In a horizontal reflection, the point \( (x, y) \) is transformed to \( (-x, y) \).
Given the point \( (-2, 1) \):
- The x-coordinate \( -2 \) gets reflected to \( 2 \), while the y-coordinate \( 1 \) remains unchanged.
Thus, the point \( (-2, 1) \) becomes \( (2, 1) \).
So the correct response is:
In the horizontal reflection, the point \( (-2, 1) \) becomes \( (2, 1) \).