$\mathbf{p} = \begin{pmatrix} k \\ 3 \end{pmatrix}$ and $\mathbf{q} = \begin{pmatrix} 2 \\ k-1 \end{pmatrix}$ are parallel vectors. Work out the possible values of $k$.

• A$k = 3$ only
• B$k = 3$ or $k = -2$
• C$k = -3$ or $k = 2$
• D$k = -2$ only

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