Is x an even integer?
✓ Correct Answer: Option D
If x² is even, x must be even. If (x+1)² is odd, then (x+1) must be odd, meaning x must be even. Both statements individually prove x is an even integer.
If x² is even, x must be even. If (x+1)² is odd, then (x+1) must be odd, meaning x must be even. Both statements individually prove x is an even integer.