[单选题]
An object is placed 40 cm in front of a 20 cm foh9csnzrl k m*.lls .0fy*0gr,cal length comecby .y1h6exgrdi c4 *a-c21nverging lens. How far is the image of thisr a6*1gc12cydyx eib -ehm4.c object from the lens?
A. $40 \; cm$
B. $20 \; cm$
C. $13 \; cm$
D. none of the given answers
