[单选题]
An object is placed 40 cm in fmh.knkiy. rrg20g 4hqli,e/) xuxy: *ront of a 20 cm focal len0i*d u+yv3:hf xu nb(qgth converging lens. How far is the image of this obf(+vudu30ih: * yxq nbject from the lens?
A. $40 \; cm$
B. $20 \; cm$
C. $13 \; cm$
D. none of the given answers
