Let h be a twice-differentiable, decreasing function of t. If h(-5) = 40 and h(15) = -20, which %3D of the following must be true on the interval (-5, 15) ? (A) h(t) is strictly decreasing on the interval. (B) h(t) has a tangent line with a slope of –3 for some t in the interval. (C) h(t) is concave down for all t in the interval. (D) h(t) is concave up for all t in the interval.

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