问题详情

The technology of freezing stem cells from different strains of chicken can do all the following EXCEPT that
A．farmers can order certain strains of chicken only.
B．Origen can supply all the strains of chicken the market might need.
C．chicken farmers order certain strains of chicken for economic reasons.
D．chicken farmers can be supplied with whatever strain they need.请帮忙给出正确答案和分析，谢谢！