Answer
(f)
Work Step by Step
Since
$$\mathbf{r}=\left(t^{2}-1\right) \mathbf{j}+2 t \mathbf{k} $$
Then
$$y=t^{2}-1,\ z=2 t \Rightarrow y=\frac{z^{2}}{4}-1$$
Hence, the graph is (f).
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