Two Machines, a and B, Are Arranged Sequentially on a Balanced

Two machines, A and B, are arranged sequentially on a balanced production line. Output from Machine A is stored in a kanban. This indicates that:

A) Machine A is a bottleneck resource.
B) Machine B is able to produce fewer units at a time than Machine A.
C) Machine A is able to produce fewer units at a time than Machine B.
D) Production on Machine A is a non-value-added activity.