【单选题】With which of the following statements concerning the stiffening of aging tissues would the author most likely agree
A．It is caused to a large degree by an increased rate of cell multiplication.
B．It paradoxically both helps and hinders the longevity of proteins in the human body.
C．It can be counteracted in part by increased ingestion of glucose-free foods.
D．It probably involves the nonenzymatic glycosylation of proteins.
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