A point has the coordinates (m, 0) and m ≠ 0.Which reflection of the point will produce an image located at (0, –m)?

Reflecting a point (x, y) across the line y = −x changes its coordinates to (−y, −x). Substituting (m, 0) gives (0, −m), which is the desired image. Therefore, the correct choice is a reflection across the line y = −x.

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