[单选题]
An object is placed 15 cm from a concave mirror l:jn8; ug(a8b rtwf- k)9ybrg o ju8t7 ck*-fxpx7ibyb0o xq0:f focal length 20 cm. The object is 4.0 cm tall.7 j0-oq cbbfty7:0uxixk*x8p How tall is the image?
A. $1.0 \; cm$
B. $2.0 \; cm$
C. $8.0 \; cm$
D. $16 \; cm$
