Question

what does the graph tell you?
the graph of c(t) tells us that the rate of change of percentage of full capacity is increasing and without bound.
the graph of c(t) tells us that the rate of change of percentage of full capacity is increasing and approaching 100.
the graph of c(t) tells us that the rate of change of percentage of full capacity is decreasing and approaching 0.
the graph of c(t) tells us that the rate of change of percentage of full capacity is increasing and approaching 0.
the graph of c(t) tells us that the rate of change of percentage of full capacity is decreasing without bound.
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Explanation:

The derivative $C^{\prime}(t)$ represents the rate of change of the percentage of full - capacity. If the graph of $C^{\prime}(t)$ is such that the function values are getting smaller and approaching the $t$-axis (where the value is 0), it means the rate of change of the percentage of full - capacity is decreasing and approaching 0.

Answer:

The graph of $C^{\prime}(t)$ tells us that the rate of change of percentage of full capacity is decreasing and approaching 0.