[单选题]
A student constructs an astronomicaj i47n-re4 aze7vs4 e a ys-lql;z+,hcl telesf:o/u xt21qq3sqv9 wk r)7rg dcope with a magnification of 10. If the telescope has a converging lens of focal length 50r2 / )vwk7d3t1o: xfru9qqsqg cm, what is the resulting length of the telescope?
A. $53 \; cm$
B. $55 \; cm$
C. $60 \; cm$
D. $75 \; cm$
