Rectangles R1 and R2, and squares S1, S2 and S3, shown below

Rectangles R1 and R2, and squares S1, S2 and S3, shown below

Rectangles R1 and R2, and squares S1, S2 and S3, shown below, combine to from a rectangle that is 3322 units wide and 2020 units high. What is the side length of S2 in units?

(A) 651 (B) 655 (C) 656 (D) 662 (E) 666

answer： A