The radius OA of ∫ fan-shaped OAB is 6, the central angle ∠ AOB is 90, and CD⊥OA is at point D,

CE⊥OB is at point e,

∴ Quadrilateral ODCE is a rectangle,

∴DE=OC=6，

EH = 23DE，

∴EH=4,HD=2，

CE = x，

∴EF=23x，

∴FH= 16？ 49x2=236？ x23，

∴S△CEH= 12×236？ x23x，

=x36？ x23，

A. Combining with the analytical formula, it is concluded that only one image meets the requirements;

B. The image is a part of a linear function and a quadratic function,

∴ does not conform to the above analytical formula, so the option is wrong;

∵ C. is an inverse proportional function image,

∴ does not conform to the above analytical formula, so the option is wrong;

D. the image is a two-part linear function,

∴ does not conform to the above analytical formula, so the option is wrong.

So choose a.