单选题：The technology of freezing stem cells from different strains

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题目内容：
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 they need
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