[单选题]
An object is placed aj5 xu 5dlt8f31qa z*s40 xge3 (ct:pfsv 62 r0eacm in front of a 20 cm focal length converging lens. How far is the image of this object from the g6 fste 2cpe a0x:3v(rlens?
A. $40 \; cm$
B. $20 \; cm$
C. $13 \; cm$
D. none of the given answers
