(x+y)2 + (y+z)2 =

1. A Option A: x2+y2+z2+2xy+4yz
2. B Option B: x2+y2+z2+4xy+2yz
3. C Option C: x2+2y2+z2+2y(x+z)
4. D Option D: x2+2y2+z2+2x(y+z)
5. E Option E: none

How we write and check questions