Because Multiple Bony Areas Span the Entire Body,the Radiation Dose

Because multiple bony areas span the entire body,the radiation dose absorbed by the organ called bone marrow

A) can be accurately measured by a direct method.
B) cannot be measured by a direct method;it can only be estimated.
C) is not of concern during any diagnostic radiography examinations.
D) can only be measured to a small degree by a direct method.