将存储在TTree T中std::vector px的读出的Branch的声明方法是：A、 std::vector *pxp = 0; TBranch *br = T.SetBranchAddress(“px”,&px);B、 std::vector *pxp = 0; TBranch *br = T.SetBranchAddress(“px”,*px);C、 std::vector *pxp = 0; TBranch *br = T.SetBranchAddress(“px”,&*px);D、 std::vector *pxp = 0; TBranch *br = T.SetBranchAddress(“px”,px);