In a system with four distinct production steps, a machine breakdown caused the time needed for one of the steps to double. As a result the capacity of the system decreased but it did not drop by half. Which of the following statements present the most reasonable explanation(s)?

	A.	This would not be a problem if arrival rates were variable.
	B.	There were multiple bottlenecks to begin with.
	C.	Another step became the bottleneck after the machine was dropped.
	D.	This step had excess capacity to begin with.
	E.	None of the above.