Testing effort can depend on a number of factors, which one of the following is MOST likely to impact the amount of effort required?

Testing effort can depend on a number of factors, which one of the following is MOST likely to impact the amount of effort required?
A . The predicted number of defects and the amount of network required
B . The ratio of developers to testers in the project team
C . The planned use of a project management tool to schedule tasks
D . The responsibilities for testers and developers being clearly defined

Answer: C