Below is the question in scope Mgmt Plan. As per my opinion , correct answer should be option A , While result showed C. Why it is so?

Linda is a first-time project manager and is analyzing a project schedule. She intends to change the schedule model due to demand and supply of resources. Which of these four statements is incorrect?

A: Resource Leveling can often cause the critical path to change, usually to increase.
B: Resource smoothing does not exceed the predefined resource limits
C: Resource Smoothing cause the critical path to change
D: Resource leveling is applied to keep resource usage at a constant level.