Both u and v vary directly with each other. When u is 10 V is 15, which of the following is not a possible pair of corresponding value of u and v?

Question

$\begin{array}{1 1} 2\;and\;3 \\ 8\;and\;12 \\ 15\;and \;20 \\ 25\;and\;37.5 \end{array} $