Final answer:
A square has 4 lines of reflection symmetry, which correspond to the lines connecting opposite vertices (diagonals) and the lines connecting the midpoints of opposite sides.
Step-by-step explanation:
The subject of this question is Mathematics, specifically focusing on the topic of geometric transformations and reflection symmetry. In the context of a square rotated about its center by 360°, we can deduce that the square maps onto itself at 4 different lines of reflection. This is because a square has four sides of equal length and four angles of equal size (90° each), which creates four axes of symmetry. If you were to draw a line connecting the midpoints of opposite sides, or draw a line connecting opposite corners (the diagonals), the square would be divided into mirror images of itself on either side of the line. These lines are called lines of reflection. Hence for a square, we can find four such lines, corresponding to the answer D) 4.