Consider a differential equation $$\frac{{{\text{dy}}\left( {\text{x}} \right)}}{{{\text{dx}}}} - {\text{y}}\left( {\text{x}} \right) = {\text{x}}$$    with the initial condition y(0) = 0. Using Euler's first order method with a step size of 0.1, the value of y(0.3) is

A. 0.01

B. 0.031

C. 0.0631

D. 0.1

Answer: Option B