Which of the following is physically the largest nation in the United Kingdom

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.

A．It presents a specific example of the process discussed in the first two paragraphs.
B．It explains a problem that the researchers mentioned in the second paragraph has yet to solve.
C．It evaluates the research discoveries described in the previous paragraph,
D．It begins a detailed description of the process introduced in the previous two paragraphs.