Answer would be $C$.
A Job is Queued and lost = $\exists_j(Q(j) \wedge L(j))$
Some Printer are Out of service = $\exists_p(F(p))$
Hence, If "A Job is Queued and lost" then "Some Printer are Out of service" = $\exists_j(Q(j) \wedge L(j))$ $\rightarrow$ $\exists_p(F(p))$