Choice "B" is correct. The theory of constraints says that organizations are impeded from achieving objectives by the existence of one or more constraints. Organizations or projects must be operated in a manner that either works around or leverages the constraint (in this case, the bottleneck).
Choice "a" is incorrect. Just-in-time (JIT) management says that efficiency improves by scheduling the deployment of resources just in time to meet customer or production requirements. JIT is not the best response to bottlenecks.
Choice "d" is incorrect. Lean manufacturing supports the use of only those resources required to meet the requirements of customers. Lean manufacturing is not an appropriate response to bottlenecks.
Choice "c" is incorrect. Demand flow manufacturing manages resources using customer demand as the basis for resource allocation. Demand flow manufacturing is not an appropriate response to bottlenecks.