9.以毛細管電泳法分析光學異構物pilocarpine和isopilocarpine時，下列何種背景電解質溶液可以提供最好的分離效果？
(A)0.1 M phosphate buffer
(B)0.1 M phosphate buffer containing 0.05 M SDS
(C)0.1 M phosphate buffer containing 0.01 M β-cyclodextrin
(D)0.1 M phosphate buffer containing 10% MeOH