[单选题]
A student constructs a.h; thw95ze z/urf.fkn astfckm3vxbn5 b-j9 n f+ tpd71e(ronomical telescope with a magnification of 10. If the tele1t5fe9n7(n-kc p3jdb +bvxfm scope has a converging lens of focal length 50 cm, what is the resulting length of the telescope?
A. $53 \; cm$
B. $55 \; cm$
C. $60 \; cm$
D. $75 \; cm$
