AMC 12 2000 Problem 22

The graph below shows a portion of the curve defined by the quartic polynomial $P(x) = x^4 + ax^3 + bx^2 + cx + d$. Which of the following is the smallest?

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\textbf{(A)}\ P(-1)\ \textbf{(B)}\ \text{The\ product\ of\ the\ zeros\ of\ } P\ \textbf{(C)}\ \text{The\ product\ of\ the\ non-real\ zeros\ of\ } P \ \textbf{(D)}\ \text{The\ sum\ of\ the\ coefficients\ of\ } P \ \textbf{(E)}\ \text{The\ sum\ of\ the\ real\ zeros\ of\ } P