A system has five workstations (A, B, C, D, and E) connected in sequence, with process times of 5, 10, 4, 9, and 8 seconds per unit each, respectively. Each workstation contains a single machine. Referring to Scenario 4 above, the throughput time of this process is:

A. 10 seconds
B. 7.1 seconds
C. 36 seconds
D. 9 seconds