If x : y = 2 : 1, then (5x2 - 13xy + 6y2) is equal to ?

Answer: Option C

$$\begin{array}{rl}& x:y=2:1\\ & \text{then, }5x^2-13xy+6y^2\\ & \Rightarrow 5\times 4-13\times 2\times 1+6\times 1^2\\ & \Rightarrow 20-26+6\\ & \Rightarrow 0\end{array}$$