Rosario quit CoverCorp Inc. without completing a high$-$priority project that she was handling. The four remaining members of her team had to work overtime to complete the project, and they demanded adequate compensation to justify their extra hours of work. In this scenario, the amount subsequently paid to them best exemplifies $\_\_\_\_\_.$

Select one:

a$.$

training costs

b$.$

vacancy costs

c$.$

replacement costs

d$.$

separation costs