There Are Four Resources and Four Jobs to Be Done

Multiple Choice

There are four resources and four jobs to be done. Assume there must be one-to-one matching between jobs and resources. The time required for each resource to do each job is as follows:

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