Geometry

Question Analysis:
This question examines understanding of how horizontal lines behave under y-axis reflection.

Key Concept Explanation:
Horizontal lines (y = constant) are parallel to the x-axis
Reflecting them across the y-axis doesn't change their equation because:
The y-values remain constant
The x-values aren't constrained in the original equation

Step-by-Step Solution:
Original equation: y = 4 (all points have y = 4, x can be any value)
Apply reflection rule: (x, y) → (-x, y)
New points will have y = 4, x = -x (still y = 4 for all x)
Final equation remains y = 4

Option Analysis:
A) Incorrect - changed y-value
B) Incorrect - became vertical line
C) Correct - equation unchanged
D) Incorrect - wrong line orien...