The parabola with equation y=a x^{2}+b x+c and vertex (h, k) is reflected about the line y=k. This results in the parabola with equation y=d x^{2}+e x+f. Which of the following equals a+b+c+d+e+f ?

**Answer Choices**

A. 2 b

B. 2 c

C. 2 a+2 b

D. 2 h

E. 2 k