The area A of the rectangle shown is described with the inequality 20 ≤ A ≤ 80.

A rectangle of length 6x and width two by three

Select the compound inequality for the area written in terms of x.

A.20 ≤ 12x ≤ 80

B.20 ≤ 9x ≤ 80

C.20 ≤ 6x ≤ 80

D.20 ≤ 4x ≤ 80