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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