[单选题]
A compound microscope , kyq)js1pkl4has tll ;n z*: aaudhh467ra 18-cm barrel and an objective with a focal length of 8.0 mm. What is the focal length of the eyepiece to give a total magnification of 2476t:znhla l * dr4ua;h0?
A. $0.13 \; cm$
B. $1.5 \; cm$
C. $1.9 \; cm$
D. $2.3 \; cm$
