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Math·Geometry and Trigonometry·Circles

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A circle in the $xy$-plane has its center at $(14,19)$ and has a radius of $7k$. Which equation represents this circle?

A

$(x-14{)}^2+(y-19{)}^2=49k$

B

$(x-14{)}^2+(y-19{)}^2=49k^2$

C

$(x-14{)}^2+(y-19{)}^2=7k$

D

$(x-14{)}^2+(y-19{)}^2=7k^2$