There Are Four Resources and Four Jobs to Be Done

Multiple Choice

There are four resources and four jobs to be done. The time required for each resource to do each job is as follows: $$\begin{array} { c } \quad \quad \quad \quad { \text { Job (Hours) } } \\\begin{array} { l c c c c } \text { Resource } & \mathrm { A } & \mathrm { B } & \mathrm { C } & \mathrm { D } \\\hline 1 & 5 & 8 & 7 & 7 \\2 & 4 & 9 & 5 & 9 \\3 & 6 & 9 & 8 & 7 \\4 & 7 & 6 & 6 & 9\end{array}\end{array}$$ After the row and column reductions, what is the minimum number of lines needed to cover all of the zeroes?

A) 0 lines
B) 1 line
C) 2 lines
D) 3 lines
E) 4 lines