The modern English began in the ______ century.

A．AGE’s are formed after a period of months or years.
B．Proteins affected by the process are made unstable.
C．Glucose attachment impairs and stiffens tissues.
D．Glucose is attached to proteins for specific purposes.

A．It paradoxically both helps and hinders the longevity of proteins in the human body.
B．It can be counteracted in part by increased ingestion of glucose-free foods.
C．It is exacerbated by increased enzymatic glycosylation.
D．It probably involves the nonenzymatic glycosylation of proteins.