(d) (3, 1)
The distance of a point from the x-axis is its y-coordinate (ordinate). For distance to be 3 units, |y| must equal 3. In option (d), the y-coordinate is 1 ≠ 3, so (3, 1) cannot be coordinates of point A.
The key concept from Section 7.1: "The distance of a point from the x-axis is called its y-coordinate, or ordinate." So the ordinate (y-value) must be ±3. Check each option: (a) y = 3 ✓, (b) y = −3 ✓, (c) y = 3 ✓, (d) y = 1 ✗. Option (d) fails.