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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The tangent slope is positive at x=0, (the graph is rising).
From x=0 to x=2, as we slide right tracing the graph,
the slope gradually becomes less and less steep (still positive though),
until it becomes 0 at x=2.
The slope (instantaneous rate of change) decreases,
so the correct choice is B.
