[单选题]
An object is 4.1 cm tall, and 10.3 cm from a3o3 r;xfv1/ iyj x0 bwes2tmi7t :2c2n pc*29, raoqq )pzicqd converging lens. The image is virtual and 6.2 cm tall.zc)2natq,i pp:*c c o2rq9d2q What is the focal length of the lens?
A. $6.8 \; cm$
B. $10 \; cm$
C. $16 \; cm$
D. $30 \; cm$