Arrange the following in the decreasing order?_x005F_x000D_  _x005F_x000D_ (√23 – √21), (√19 – √17), (√21 – √19)_x005F_x000D_

• A. (√23 – √21) > (√21 – √19) > (√19 – √17)_x005F_x000D_
• B. (√23 – √21) > (√19 – √17) > (√21 – √19)_x005F_x000D_
• C. (√19 – √17) > (√21 – √19) > (√23 – √21)_x005F_x000D_
• D. (√21 – √19) > (√23 – √21) > (√19 – √17)