[单选题]
A student constructs an astronomical gvdtj0ir1/dh * 49c xutelescope with a magnificati, 2gspn*ra8xjosj:x s-s0ki/ on of 10. If the telescosjsg8-r,p0/ *xi js2o axns: kpe 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. $75 \; cm$
