A process consists of five machines producing a metal part. The parts move in sequence from Machine 1 to Machine 5. Processing at Machine 1 takes 10 seconds then the parts move to Machine 2 where processing takes 15 seconds. In Machine 3, the processing takes 12 seconds and in Machine 4, the processing takes 20 seconds. The parts finally move to Machine 5 where processing takes 18 seconds. Which machine in this process is the bottleneck machine? 单项选择题
A
Machine 1
B
Machine 2
C
Machine 3
D
Machine 4
E
Machine 5
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