[单选题]
An object is placed 15 cm frl 1 l(pnm1h qwrw d.:z/.k duv7.dond-omso,ztrl6;rij.rk+ i;5y:p pb a concave mirror of focal length 20 cm. The object is 4.0 cm tall. How tar ks65oi;pjbz+r ty,;pl:i .r ll is the image?
A. $1.0 \; cm$
B. $2.0 \; cm$
C. $8.0 \; cm$
D. $16 \; cm$
