Editors' workloads were increasing during the 1990s, as the following table shows.

\begin{array} { | l | l | l | l | l | } \hline & \mathbf { 1 9 9 3 } & \mathbf { 1 9 9 4 } & \mathbf { 1 9 9 5 } & \mathbf { 1 9 9 6 } \\\hline \text { Books/Editor } & 2.9 & 4 & 4.8 & 5.5 \\\hline \text { Editors } & 20,000 & 18,000 & 9,500 & 10,000 \\\hline\end{array}

Which matrix expression would estimate the total number of books edited during the years 1993-1996

A)

\left[ \begin{array} { l l l l } 20,000 & 18,000 & 9,500 & 10,000\end{array} \right] \cdot \left[ \begin{array} { c } 2.9 \\4 \\4.8 \\5.5\end{array} \right]

\left[ \begin{array} { l l l l } 2.9 & 4 & 4.8 & 5.5\end{array} \right] \cdot \left[ \begin{array} { c } 20,000 \\18,000 \\9,500 \\10,000\end{array} \right]

C) Both

\left[ \begin{array} { l l l l } 2.9 & 4 & 4.8 & 5.5\end{array} \right] \cdot \left[ \begin{array} { c } 20,000 \\18,000 \\9,500 \\10,000\end{array} \right]

and

\left[ \begin{array} { l l l l } 20,000 & 18,000 & 9,500 & 10,000\end{array} \right] \cdot \left[ \begin{array} { c } 2.9 \\4 \\4.8 \\5.5\end{array} \right]

D) Both

\left[ \begin{array} { l l l l } 2.9 & 4 & 4.8 & 5.5\end{array} \right] \cdot \left[ \begin{array} { c } 10,000 \\9,500 \\18,000 \\20,000\end{array} \right]

and

\left[ \begin{array} { l l l l } 20,000 & 18,000 & 9,500 & 10,000\end{array} \right] \cdot \left[ \begin{array} { c } 5.5 \\4.8 \\4 \\2.9\end{array} \right]

\left[ \begin{array} { c } 20,000 \\18,000 \\9,500 \\10,000\end{array} \right] \cdot \left[ \begin{array} { l l l l } 2.9 & 4 & 4.8 & 5.5\end{array} \right]

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Multiple Choice