[单选题]
An object is 4.1 cm ta;n lxn q*a7(enll, and 10.3 cm from a converging lens. The iuw hf*df 3fdr)y*spj*.tc4z .mage is virtual and 6.2 cm tall. What is the focalzfdw jy*f.tds*.u4c rpf)h*3 length of the lens?
A. $6.8 \; cm$
B. $10 \; cm$
C. $16 \; cm$
D. $30 \; cm$
