Which of the following words contains two morphemes

A．It takes place more slowly than glyeosylation in the human body.
B．It requires a higher ratio of glucose to protein than glycosylation requires in the human body.
C．It does not require the aid of enzymes to attach glucose to protein.
D．It proceeds more quickly when the food proteins have a molecular structure similar to that of crystallin 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.