Table 71 the Figure Above Shows the Call Routing Process

Multiple Choice

Table 7.1 The figure above shows the call routing process for a customer service call center.Incoming calls are routed,depending on the complexity of the caller's request.Simple request are routed to work center B,while the more complex calls are routed to work center C (which also takes simple calls when not busy) .The numbers in parentheses are the time in minutes for each step of the process.
-Use the information in Table 7.1.What is the throughput time for the process,assuming that the Call Center is always busy and has customers waiting to be processed?

A) 24 minutes
B) 18 minutes
C) 20 minutes
D) 22 minutes