Answer:
C. The 4 columns of UQ list the total costs for materials, labor, and overhead used to manufacture products B and C during the 4 quarters of the year.
Explanation:

is a vector in the set of real numbers
that lists the output (measured in dollars) of products B and C manufactured during the first quarter of the year.
Therefore:
![UQ=\left\begin{array}{ccc}\\$Cost of Materials\\ $Cost of Labour\\ $Cost of Overhead\end{array}\right\left(\begin{array}{cc}$Product B&$Product C\\0.45&0.42\\ 0.25&0.35\\ 0.15&0.15\end{array}\right)\left(\begin{array}{ccc}q_(1B)\\q_(1C)\end{array}\right)\left(\begin{array}{ccc}q_(2B)\\q_(2C)\end{array}\right)\left(\begin{array}{ccc}q_(3B)\\q_(3C)\end{array}\right)\left(\begin{array}{ccc}q_(4B)\\q_(4C)\end{array}\right)]()
Therefore, UQ has 4 columns and 3 rows.
The 4 columns of UQ list the total costs for materials(Row 1), labor(Row 2), and overhead(Row 3) used to manufacture products B and C during the 4 quarters of the year.