Which answer below is closest to the magnitude of the acceleration of Stapp and his sled as their speed increased from zero to 67 $\mathrm{m} / \mathrm{s}$ ?
\begin{equation}\begin{array}{ll}{\text { (a) } 5 \mathrm{m} / \mathrm{s}^{2}} & {\text { (b) } 6 \mathrm{m} / \mathrm{s}^{2}} & {\text { (c) } 10 \mathrm{m} / \mathrm{s}^{2}} \\ {\text { (d) } 12 \mathrm{m} / \mathrm{s}^{2}} & {\text { (e) } 14 \mathrm{m} / \mathrm{s}^{2}}\end{array}\end{equation}