With your help, there is no doubt ______ our plan is meant for will work out successfully. [ ]

A. that what

B. whether that

C. what that

D. that which

以下哪一项叙述是错误的

A．B₂细胞发生在骨髓
B．内源性抗原是经MHCⅠ类分子途径呈递给CTL
C．外源性抗原是经MHCⅡ分子途径呈递给Th细胞
D．CD₃的功能为传递T细胞受抗原刺激产生的活化信号至细胞内
E．T细胞表面的CD₂₈与APC表面的CD₈₀相互作用产生促使T细胞完全活化的第一信号