Answer
B
Work Step by Step
The slope of the tangent line through the point on the graph of $f$ where $x=a$
is given by the instantaneous rate of change, or derivative
$m_{tan}=$ slope of tangent = instantaneous rate of change = derivative $=f^{\prime}(a)$
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At x=0 the slope of the tangent is negative
(the function decreases as we move to the right)
Tracing the graph from x=0 to the right, to x=200,
we note that the tangents never break the horizontal,
that is, the tangents are always descending, with negative slope.
So, our choice is B.
