Jasper and Jasper, a law firm, is in the process of initiating an ABC system. So far, the firm has traced its costs to the following activities: legal research; taking depositions; court-based litigation; and continuing legal education for staff members. If the firm wants to reduce its non-value-added activities to the greatest extent possible, it should concentrate its efforts on reducing the amount of time and money it spends on

A : court-based litigation.

B : taking depositions.

C : continuing legal education.

D : legal research.