Katie performed the steps shown to solve a quadratic equation using the method of completing the square: Step 1: x^2 +4x - 6 = 0
Step 2: x^2 + 4x = 6

What represents the next correct step she should take?
A. x^2 + 4x + 2 = 6 + 2
B. x^2 + 4x + 2 = 6 - 2
C. x^2 + 4x + 4 = 6 + 4
D. x^2 + 4x + 4 = 6 - 4

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