$ABCD$ is a kite with $AB = AD$ and $CB = CD$. Triangle $ABD$ is equilateral. Angle $BCD = x°$. Write an expression, in terms of $x$, for the size of angle $ABC$.

• A$\left(60 + \frac{x}{2}\right)°$
• B$\left(150 - \frac{x}{2}\right)°$
• C$(150 - x)°$
• D$\left(180 - \frac{x}{2}\right)°$

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