About 80% of what you see floating in a ray of sunshine is ______.

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.

A．convictions can be made on confessions and statements taken by police officers from accused persons and are valid legal evidence
B．convictions can’t be made on confessions alone and there should be a third party when tak ing statements from accused persons
C．convictions can be made on confessions and a third party should be present when taking statements from accused persons
D．convictions can’t be made on confessions alone and the statements taken by police officers from accused persons are valid legal evidence