[单选题]
A student constructs an astronomical telescope w 2zue*mj. ln*xith a magnificmz5w0s2mcm22bro yu, b1 o38 jiyss+bation of 10. If the telescope has a converging lens of focal lenm w2bj bz2yssym21 rb3ocmso,50i8 +ugth 50 cm, what is the resulting length of the telescope?
A. $53 \; cm$
B. $55 \; cm$
C. $60 \; cm$
D. $75 \; cm$
