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By solving using Euler's method. $x_0 = 0, y_0 = 1, x_1 = 0.1$

At $(x_0, y_0)$, $\frac{dy}{dx} = x^2y - 1 = -1$.

Now, $\frac{dy}{dx} \approx \frac{y_1 - y_0}{x_1 - x_0}$.

On putting values, you get $y_1 = 0.9$.

Hence, D = $0.9$ is the answer.

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