What is the y-intercept of the graph of the function f(x) = x2 + 3x + 5?

The y-intercept is where the graph crosses the y-axis, so x = 0. Substituting into f(x) = x² + 3x + 5 gives f(0) = 0² + 3(0) + 5 = 5. Therefore, the y-intercept is (0, 5), choice D.

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