Determine whether the graph of the quadratic function y = - x^2 - 10x + 1 opens upward or downward. Explain.
A. Because a > 0, the parabola opens upward.
B. Because a < 0, the parabola opens upward.
C. Because a < 0, the parabola opens downward.
D. Because a > 0, the parabola opens downward.
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