Cost Control Can Be Approached as an Application of Pareto's $50 ; 50$

Cost control can be approached as an application of Pareto's law, which states that ???? percent of the project's outcome is determined by ????percent of the included elements .

A) $50 ; 50$
B) $80 ; 20$
C) $25 ; 75$
D) $50 ; 60$
E) $100 ; 25$