The length of a rectangle is 4r²s⁵ units, and the rectangle's area is 20r⁵s⁷ square units. If r ≠ 0 and s ≠ 0, which of the following best describes the width of the rectangle?
A. 5r³s² units
B. 5r⁷s¹² units
C. 16r³s² units
D. 80r⁷s¹² units​