When resource leveling craft labor for a critical path schedule, the scheduler

 Resource Leveling:

Resource leveling adjusts start and finish dates of activities to resolve resource conflicts or constraints, balancing availability and demand.

In construction projects, breaks in continuity of work for subcontractors can result in increased costs due to remobilization and demobilization.

 PSP Study Guide References:

The PSP guide explains that resource leveling must be carefully analyzed to avoid disruptions in work continuity​.

 Conclusion: The correct answer is A, as the scheduler must account for potential cost implications of resource leveling on subcontractors.