Moderate# Error in Euler's Method Approximation 1

APCALC-FFZYLW

Let $\cfrac{dy}{dx}=x$ and $y\left(0\right)=0$.

Which of the following is closest to the error in the calculation of $y\left(1.0\right)$ if Euler's Method is used a step size of $\Delta x=0.5$?