All of the following are techniques project managers can use to accelerate the project schedule, EXCEPT:

A) improving quality.
B) reassigning resources.
C) changing the scope.
D) adding additional resources.
E) using contingency resources

Improving quality may not necessarily accelerate the project schedule as it may require more time and resources to achieve higher quality standards. The other options such as reassigning resources, changing scope, adding additional resources, and using contingency resources are all techniques that can potentially speed up the project schedule.