[单选题]
How far from a lens of focal length 5682tfcuq4y*c)etk 7s g8lj gf0 m e(v* (z*aecm/zkstvy wu p-;ian7h2,m must the object be placed if it is to form a virtual image magn 2-pn ey( 7a/vvum*wesi t*,a( cz;zhkified in size by a factor of three?
A. $33 \; mm$
B. $42 \; mm$
C. $48 \; mm$
D. $54 \; mm$
