Compared with the Traditional Material in the Front of a Cassette

Compared with the traditional material in the front of a cassette (aluminum or cardboard) ,the cassette front containing the carbon fiber absorbs approximately ______ as much radiation,resulting in a __________ dose for the patient because ________ radiographic techniques are required to produce the recorded image.

A) four times,higher,higher
B) three times,higher,higher
C) twice,higher,higher
D) half,lower,lower