How would you solve this? I'm knew to cross sections. thank you!

X. 12 28. The base of a solid is the shaded region in the first quadrant bounded by the graphs of y = sin 12 and y = x, as shown in the figure. For the solid, each cross section perpendicular to the x-axis is a square. Which of the following gives the volume of the solid? 12 (A) dr + JEX 36 sin 12 dx 12 (B) it 36 x 2 dx + sin dx (C) (Vain ( iz ) (D) V sin 12 - X 6 dx