The solution of the system of equations x + y + z = 4, x - y + z = 0, 2x + y + z = 5 is

• A. x = 2, y = 2, z = 0
• B. x = 1, y = 4, z = 1
• C. x = 2, y = 4, z = 3
• D. x = 1, y = 2, z = 1