Which of the following pair of equations has no solution?

• A. x - 2y = 0 and 3x + 4y - 20 = 0
• B. x + 2y + 1 = 0 and 2x + 4y + 2 = 0
• C. 2x - y = 0 and x - 2y = 0
• D. x + 2y - 5 = 0 and 2x + 4y - 12 = 0