What Is the Three-Step Sequence in Applying the Unit Analysis

What is the three-step sequence in applying the unit analysis method of problem solving?

A) 1-unknown unit,2-unit factor,3-relevant given value
B) 1-unknown unit,2-relevant given value,3-unit factor
C) 1-relevant given value,2-unknown unit,3-unit factor
D) 1-unit factor,2-unknown unit,3-relevant given value
E) 1-unit factor,2-relevant given value,3-unknown unit